ANSYS Parametric Design Language Guide

ANSYS Parametric Design Language Guide
Release 14.0ANSYS,Inc.
November 2011Southpointe
275 Technology Drive
Canonsburg,PA 15317 ANSYS,Inc.is
certified to ISO
9001:2008.
ansysinfo@ansys.com
http://www.ansys.com
(T) 724-746-3304
(F) 724-514-9494

Copyright and Trademark Information
© 2011 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is prohibited.
ANSYS, ANSYS Workbench, Ansoft, AUTODYN, EKM, Engineering Knowledge Manager, CFX, FLUENT, HFSS and any
and all ANSYS, Inc. brand, product, service and feature names, logos and slogans are registered trademarks or
trademarks of ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark used
by ANSYS, Inc. under license. CFX is a trademark of Sony Corporation in Japan. All other brand, product, service
and feature names or trademarks are the property of their respective owners.
Disclaimer Notice
THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID-
ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products
and documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreement
that contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exporting
laws, warranties, disclaimers, limitations of liability, and remedies, and other provisions. The software products
and documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditions
of that software license agreement.
ANSYS,Inc.is certified to ISO 9001:2008.
U.S. Government Rights
For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use,
duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc.
software license agreement and FAR 12.212 (for non-DOD licenses).
Third-Party Software
See the legal information in the product help files for the complete Legal Notice for ANSYS proprietary software
and third-party software. If you are unable to access the Legal Notice, please contact ANSYS, Inc.
Published in the U.S.A.

Table of Contents
1.Introducing APDL .................................................................................................................................... 1
2.Working with the Toolbar ........................................................................................................................ 3
2.1.Adding Commands to the Toolbar ..................................................................................................... 3
2.2.Modifying the Toolbar ....................................................................................................................... 3
2.2.1. Example: Adding a Toolbar Button ............................................................................................ 4
2.2.2.Saving Toolbar Buttons ............................................................................................................. 5
2.3. Nesting Toolbar Abbreviations .......................................................................................................... 5
3. Using Parameters .................................................................................................................................... 7
3.1. Guidelines for Parameter Names ....................................................................................................... 8
3.1.1.Hiding Parameters from *STATUS .............................................................................................. 8
3.2. Defining Parameters ......................................................................................................................... 9
3.2.1. Assigning Parameter Values During Execution .......................................................................... 9
3.2.2. Assigning Parameter Values At Startup ..................................................................................... 9
3.2.3.Assigning ANSYS-Supplied Values to Parameters ..................................................................... 10
3.2.3.1. Using the *GET Command ............................................................................................. 10
3.2.3.2. Using In-line Get Functions ............................................................................................ 11
3.2.4.Listing Parameters .................................................................................................................. 11
3.3. Deleting Parameters ....................................................................................................................... 12
3.4. Using Character Parameters ............................................................................................................ 12
3.5. Substitution of Numeric Parametric Values ...................................................................................... 13
3.5.1.Preventing Substitution .......................................................................................................... 13
3.5.2. Substitution of Character Parametric Values ............................................................................ 13
3.5.2.1. Forced Substitution ....................................................................................................... 13
3.5.2.2.Other Places Where Character Parameters Are Valid ........................................................ 14
3.5.2.3. Character Parameter Restrictions ................................................................................... 15
3.6. Dynamic Substitution of Numeric or Character Parameters .............................................................. 15
3.7. Parametric Expressions ................................................................................................................... 16
3.8. Parametric Functions ...................................................................................................................... 16
3.9.Saving, Resuming, and Writing Parameters ....................................................................................... 17
3.10.Array Parameters ........................................................................................................................... 18
3.10.1. Array Parameter Basics ......................................................................................................... 19
3.10.2. Array Parameter Examples .................................................................................................... 20
3.10.3.TABLE Type Array Parameters ................................................................................................ 21
3.10.4. Defining and Listing Array Parameters .................................................................................. 22
3.10.5. Specifying Array Element Values ........................................................................................... 23
3.10.5.1. Specifying Individual Array Values ................................................................................ 23
3.10.5.2. Filling Array Vectors ..................................................................................................... 25
3.10.5.3.Interactively Editing Arrays ........................................................................................... 25
3.10.5.4. Filling an Array From a Data File Using *VREAD ............................................................. 26
3.10.5.5. Filling a TABLE Array From a Data File Using *TREAD ..................................................... 26
3.10.5.6. Interpolating Values ..................................................................................................... 30
3.10.5.7. Retrieving Values into or Restoring Array Parameter Values ........................................... 31
3.10.5.8. Listing Array Parameters .............................................................................................. 32
3.10.6.Writing Data Files ................................................................................................................. 33
3.10.6.1. Format Data Descriptors .............................................................................................. 33
3.10.7. Operations Among Array Parameters .................................................................................... 35
3.10.7.1.Vector Operations ........................................................................................................ 35
3.10.7.2. Matrix Operations ........................................................................................................ 37
3.10.7.3.Specification Commands for Vector and Matrix Operations ........................................... 39
3.10.8. Plotting Array Parameter Vectors .......................................................................................... 42
iii
Release 14.0 - © SAS IP,Inc.All rights reserved.- Contains proprietary and confidential information
of ANSYS,Inc.and its subsidiaries and affiliates.

3.10.9. Modifying Curve Labels ........................................................................................................ 43
4. APDL Math ............................................................................................................................................ 47
4.1.Procedure for using APDL Math ....................................................................................................... 48
4.2. Matrix and Vector Sizes ................................................................................................................... 49
4.3.Accessing Complex Scalar Values ..................................................................................................... 49
4.4. Degree of Freedom Ordering .......................................................................................................... 50
4.5. Creating a User Superelement ......................................................................................................... 51
4.6. Restrictions and Recommendations for Matrix Operations ............................................................... 51
4.7. APDL Math Examples ...................................................................................................................... 52
5. APDL as a Macro Language ................................................................................................................... 55
5.1. Creating a Macro ............................................................................................................................ 56
5.1.1. Macro File Naming Conventions ............................................................................................. 56
5.1.2. Macro Search Path ................................................................................................................. 57
5.1.3. Creating a Macro Within ANSYS .............................................................................................. 57
5.1.3.1.Using *CREATE ............................................................................................................... 57
5.1.3.2.Using *CFWRITE ............................................................................................................. 58
5.1.3.3. Using /TEE ..................................................................................................................... 58
5.1.3.4. Using Utility Menu> Macro> Create Macro ..................................................................... 59
5.1.4. Creating Macros with a Text Editor .......................................................................................... 59
5.1.5. Using Macro Library Files ........................................................................................................ 60
5.2.Executing Macros and Macro Libraries ............................................................................................. 61
5.3. Local Variables ................................................................................................................................ 62
5.3.1.Passing Arguments to a Macro ................................................................................................ 62
5.3.2. Local Variables Within Macros ................................................................................................. 62
5.3.3. Local Variables Outside of Macros ........................................................................................... 63
5.4. Controlling Program Flow in APDL .................................................................................................. 63
5.4.1. Nested Macros: Calling Subroutines Within a Macro ................................................................ 63
5.4.2. Unconditional Branching: Goto ............................................................................................... 63
5.4.3. Conditional Branching:The *IF Command ............................................................................... 64
5.4.4.Repeating a Command ........................................................................................................... 66
5.4.5. Looping: Do-Loops ................................................................................................................. 66
5.4.6. Implied (colon) Do Loops ....................................................................................................... 67
5.4.7. Additional Looping: Do-While ................................................................................................. 67
5.5.Control Functions Quick Reference .................................................................................................. 68
5.6.Using the _STATUS and _RETURN Parameters in Macros ................................................................... 69
5.7. Using Macros with Components and Assemblies ............................................................................. 71
5.8. Reviewing Example Macros ............................................................................................................. 71
6.Interfacing with the GUI ........................................................................................................................ 73
6.1.Prompting Users for a Single Parameter Value .................................................................................. 73
6.2. Prompting Users With a Dialog Box ................................................................................................. 74
6.3.Using Macros to Display Your Own Messages ................................................................................... 76
6.4. Creating and Maintaining a Status Bar from a Macro ........................................................................ 77
6.5. Picking within Macros ..................................................................................................................... 78
6.6.Calling Dialog Boxes From a Macro .................................................................................................. 79
7. Encrypting Macros ................................................................................................................................ 81
7.1. Preparing a Macro for Encryption .................................................................................................... 81
7.2. Creating an Encrypted Macro .......................................................................................................... 82
7.3. Running an Encrypted Macro .......................................................................................................... 82
8.APDL Commands ................................................................................................................................... 83
A. APDL Gateway Commands ...................................................................................................................... 85
B. GET Function Summary ........................................................................................................................... 91
Index .......................................................................................................................................................... 97
of ANSYS,Inc.and its subsidiaries and affiliates.iv

List of Figures
2.1.Toolbar ................................................................................................................................................... 3
2.2. Adding a New Abbreviation .................................................................................................................... 4
2.3.Toolbar with New Button ........................................................................................................................ 5
3.1. A Graphical Representation of a 2-D Array ............................................................................................. 19
3.4.A Graphical Representation of a Table Array ........................................................................................... 22
3.5. An Example *VEDIT Dialog Box for an ARRAY ......................................................................................... 25
3.6. An Example *VEDIT Dialog Box for a TABLE ............................................................................................ 26
3.7.A Sample 1-D TABLE Array Dialog Box .................................................................................................... 28
3.10.Time-History Forcing Function ............................................................................................................. 31
3.11. Sample Plot Using *VPLOT,,arrayval(1,1),2 ........................................................................... 42
3.12. Sample Plot Using *VPLOT,,tableval(1,1),2 ........................................................................... 43
3.13.Sample Plot Using *VPLOT,table2(1),tableval(1,1),2 ........................................................ 43
3.14. Sample Plot Using *VPLOT,tableval(1,0),tableval(1,1),2 ............................................... 43
3.15. Sample Plot With User-specified Labels ............................................................................................... 45
4.1. 3-D Representation of a Complex Dense Matrix ..................................................................................... 49
5.1. ANSYS Message Box for Unknown Command ........................................................................................ 56
5.2.The Create Menu Dialog Box ................................................................................................................. 59
5.3. A Macro Created in a Text Editor ............................................................................................................ 60
5.4.A Sample If-Then-Else Construct ............................................................................................................ 65
6.1.An Example *ASK Dialog Box ................................................................................................................. 74
6.2.A Typical Multiple-Prompt Dialog Box .................................................................................................... 75
6.3. A Typical Status Dialog Box ................................................................................................................... 78
List of Tables
5.1. _RETURN Values .................................................................................................................................... 69
B.1. *GET - Get Function Summary ............................................................................................................... 91
v

of ANSYS,Inc.and its subsidiaries and affiliates.vi

Chapter 1: Introducing APDL
APDL stands for ANSYS Parametric Design Language, a scripting language that you can use to automate
common tasks or even build your model in terms of parameters (variables). While all ANSYS commands
can be used as part of the scripting language, the APDL commands discussed here are the true scripting
commands and encompass a wide range of other features such as repeating a command, macros, if-
then-else branching, do-loops, and scalar, vector and matrix operations.
While APDL is the foundation for sophisticated features such as adaptive meshing, it also offers many
conveniences that you can use in your day-to-day analyses. In this guide we'll introduce you to the
basic features - parameters; macros; branching, looping, and repeating; and array parameters - and
show you some simple examples. As you become more adept at the language, you will begin to recognize
applications for APDL in your own environment.
This guide covers the following topics:
• Working with the toolbar: You can add frequently used ANSYS functions or macros to the ANSYS
toolbar by defining abbreviations, which are aliases (up to eight characters long) for an ANSYS
command, GUI function name, or macro name.
• Using parameters: Parameters are APDL variables (they are more similar to Fortran variables than
to Fortran parameters). ANSYS uses two types of parameters: scalar and array.
• Using APDL Math for matrix manipulations: APDL Math gives you access to matrix manipulation
routines, including fast and efficient solvers. APDL Math provides access to matrices and vectors
on the .FULL, .EMAT, .MODE and .SUB files, as well as other sources, so that you can read them
in, manipulate them, and write them back out or solve them directly. Both dense matrices and
sparse matrices can be manipulated using APDL Math.
• Understanding APDL as a macro language, including creating a macro: You can record a frequently
used sequence of ANSYS commands in a macro file (these are sometimes called command files).
Creating a macro enables you to, in effect, create your own custom ANSYS command. In addition
to executing a series of ANSYS commands, a macro can call GUI functions or pass values into argu-
ments.
• Interfacing with the GUI: Within an ANSYS macro, you have several ways to access components of
the ANSYS GUI (toolbar, dialog box, *ASK command, etc.).
• Encrypting macros: ANSYS provides the ability to encrypt macro files so that the source is not
"human-readable." Encrypted macros require an encryption key to run. You can either place the
encryption key explicitly (in readable ASCII) in the macro or you can set it in ANSYS as a global
encryption key.
See the APDL Commands for a list of all APDL commands discussed in this guide.
1

of ANSYS,Inc.and its subsidiaries and affiliates.2

Chapter 2:Working with the Toolbar
You can add frequently used ANSYS functions or macros to the ANSYS toolbar by defining abbreviations,
which are aliases (up to eight characters long) for an ANSYS command, GUI function name, or macro
name. You can also modify the toolbar and nest toolbar abbreviations,
The following toolbar topics are available:
2.1.Adding Commands to the Toolbar
2.2.Modifying the Toolbar
2.3.Nesting Toolbar Abbreviations
2.1.Adding Commands to the Toolbar
You can add frequently used ANSYS functions or macros to the ANSYS toolbar (creating macros is
covered starting in "APDL as a Macro Language"). You do this by defining abbreviations. An abbreviation
is an alias (up to eight characters long) for an ANSYS command, GUI function name, or macro name.
For example, MATPROP might be an abbreviation for a macro that lists material properties, SAVE_DB
is an abbreviation for the SAVE command, and QUIT is an abbreviation for the Fnc_/EXIT function
(which launches the Exit from ANSYS dialog box). APDL commands that can be used to define abbrevi-
ations are listed in Chapter 2 of the Command Reference.
The ANSYS program provides two ways to use abbreviations. You can issue the abbreviation (and execute
the macro, command, etc. that it performs) by typing it at the beginning of a command line. If you are
using the ANSYS GUI, you can also execute the macro or command by pressing the appropriate button
on the ANSYS toolbar.
The toolbar shown in Figure 2.1 (p. 3) contains buttons that correspond to existing abbreviations.
Figure 2.1 Toolbar
While some abbreviations, such as SAVE_DB, are predefined, the abbreviations the toolbar contains and
the functions they execute are up to you. A single toolbar can hold up to 100 abbreviations (you can
"nest" toolbars to extend this number). You can redefine or delete abbreviations at will; however, abbre-
viations are not automatically saved and must be explicitly saved to a file and reloaded for each ANSYS
session.
2.2.Modifying the Toolbar
You can create abbreviations either through the *ABBR command or through the Utility Menu> Macro>
Edit Abbreviations or Utility Menu> MenuCtrls> Edit Toolbar menu items. Using one of the menu
items is preferable for two reasons:
3

• Clicking OK automatically updates the toolbar (using the *ABBR command requires that you use
the Utility Menu> MenuCtrls> Update Toolbar menu item to make your new abbreviation appear
on the toolbar).
• You can easily edit the abbreviation if required.
The syntax for the *ABBR command and related dialogs is
*ABBR, Abbr, String
Abbr
The abbreviation name that will appear on the toolbar button. The name can contain up to eight char-
acters.
String
The String argument is the name of the macro or command that Abbr represents. If String is the name
of a macro, the macro must be within the macro search path. For more information about using macros,
see "APDL as a Macro Language". If String references an ANSYS picking menu or dialog box (using
UIDL), then specify "Fnc_string." For example, in the abbreviation definitions for "QUIT" and "POWRGRPH"
shown above, "Fnc_/QUIT" and "Fnc_/GRAPHICS" are unique UIDL function names which identify the
ANSYS picking menu or dialog box associated with the QUIT and POWRGRPH abbreviations respectively.
For more information about accessing UIDL functions, see Calling Dialog Boxes From a Macro. String
can contain up to 60 characters but cannot include any of the following:
• The character "$"
• The commands C***, /COM, /GOPR, /NOPR, /QUIT, /UI, or *END
The default ANSYS toolbar has the following abbreviations predefined:
*ABBR, SAVE_DB, SAVE
*ABBR, RESUM_DB, RESUME
*ABBR, QUIT, Fnc_/EXIT
*ABBR, POWRGRPH, Fnc_/GRAPHICS
2.2.1.Example: Adding a Toolbar Button
For example, to add a button to the toolbar that calls the macro file mymacro.mac, you would enter
the values shown in the following figure in the Utility Menu> MenuCtrls> Edit Toolbar dialog box.
Figure 2.2 Adding a New Abbreviation
Chapter 2:Working with the Toolbar

The new button is appended to the button bar as shown in the following figure.
Figure 2.3 Toolbar with New Button
2.2.2.Saving Toolbar Buttons
Toolbar buttons are not persistent from one ANSYS session to the next; however, they are saved and
maintained in the database so that any "resume" of the session will still contain these abbreviations.
To save your custom button definitions, you must explicitly save them to a file through the Utility
Menu> MenuCtrls> Save Toolbar menu item (ABBSAV command) and restore them for each session
using the Utility Menu> MenuCtrls> Restore Toolbar menu item (ABBRES command). You can do
this programmatically in a macro.
Note
If any abbreviations already exist in the named file, the ABBSAV command overwrites them.
The format of the abbreviations file is the APDL commands that are used to create the abbreviations.
Thus, if you wish to edit a large set of buttons or change their order, you may find using a text editor
to be the most convenient method. For example, the following is the file that results from saving the
default toolbar buttons.
/NOPR
*ABB,SAVE_DB ,SAVE
*ABB,RESUM_DB,RESUME
*ABB,QUIT ,Fnc_/EXIT
*ABB,POWRGRPH,Fnc_/GRAPHICS
/GO
The *ABB commands (the abbreviated form of *ABBR) define the buttons. The /NOPR at the top turns
off echoing to the log file while the /GO at the bottom turns log file echoing on.
2.3.Nesting Toolbar Abbreviations
The save-and-restore features described above allow you to nest abbreviations. By nesting abbreviations
under one button, you can define specialized toolbars (if you have many abbreviations, having them
on a single toolbar can be cluttered, making it difficult to find the proper button). To nest abbreviations,
you simply define an abbreviation that restores an abbreviation file. For example, the following command
defines PREP_ABR as an abbreviation that restores abbreviations from the file prep.abbr.
*ABBR,PREP_ABR,ABBRES,,PREP,ABBR
PREP_ABR will appear as a button on the toolbar. Clicking it will replace the existing buttons with the
set of buttons defined in the prep.abbr file.
By defining abbreviations to restore these files and including those abbreviations in the appropriate
files, you can have a virtually unlimited number of abbreviations in a given ANSYS session. You can
even extend this concept and create your own menu hierarchy by nesting several abbreviation files. If
you implement such a hierarchy, it's a good practice to add an abbreviation as a "return" button in each
file to navigate back through the menus.
5
Nesting Toolbar Abbreviations

Chapter 3: Using Parameters
Parameters are APDL variables (they are more similar to Fortran variables than to Fortran parameters).
You don't need to explicitly declare the parameter type. All numeric values (whether integer or real)
are stored as double-precision values. Parameters that are used but not defined are assigned a near-
zero, or "tiny," value of approximately 2-100
. For example, if parameter A is defined as A=B, and B is not
defined, then A is assigned the tiny value.
ANSYS uses two types of parameters: scalar and array. The first part of this chapter discusses information
that is applicable to both types. Starting with Array Parameters (p. 18), the information is specific to
array type parameters. APDL commands used to define parameters in general and array parameters
specifically are listed in Chapter 2 of the Command Reference.
Character strings (up to eight characters long) can be assigned to parameters by simply enclosing the
string in single quotes. APDL also provides several types of array parameters: numeric, character, string
and table (a special numeric type that automatically interpolates values).
You can use a parameter (instead of a literal number or character string) as an argument to any ANSYS
command; the parameter is evaluated and its current value is used for that argument. For example, if
you assign the value 2.7 to a parameter named AA and then issue the command
N,12,AA,4
the ANSYS program will interpret the command as
N,12,2.7,4
(which defines node 12 at X=2.7 and Y=4).
Note
If array, table, or character parameters are used within a macro or input file, those parameters
should be dimensioned (if array or table) and defined within that macro or input file. If you
fail to follow this practice, ANSYS will produce error messages stating that those parameters
are undefined. ANSYS will produce the error messages even if the parameters lie within un-
executed *IF statements, as parameter substitution is done before the branching for the *IF
is checked.
The following parameter topics are available:
3.1.Guidelines for Parameter Names
3.2.Defining Parameters
3.3.Deleting Parameters
3.4.Using Character Parameters
3.5.Substitution of Numeric Parametric Values
3.6.Dynamic Substitution of Numeric or Character Parameters
3.7.Parametric Expressions
3.8.Parametric Functions
3.9.Saving,Resuming,and Writing Parameters
7

3.10.Array Parameters
3.1.Guidelines for Parameter Names
Parameter names must:
• Begin with a letter
• Contain only letters, numbers, and underscore characters
• Contain no more than 32 characters
Examples of valid and invalid parameter names are
Valid:
ABC
PI
X_OR_Y
Invalid:
MY_PARAMETER_NAME_LONGER_THAN_32_CHARACTERS (more than 32 characters)
2CF3 (begins with a number)
M&E (invalid character "&")
When naming parameters:
• Avoid parameter names that match commonly used ANSYS labels, such as:
– Degree of freedom (DOF) labels (TEMP, UX, PRES, etc.)
– Convenience labels (ALL, PICK, STAT, etc.)
– User-defined labels (such as those defined with the ETABLE command)
– Array type field labels (such as CHAR, ARRAY, TABLE, etc.)
• Parameter names ARG1 through ARG9 and AR10 through AR99 are reserved for local parameters.
Generally, local parameters are used in macros (see Local Variables). Use of these names as "regular"
parameters is not recommended.
• Parameter names must not match abbreviations defined with the *ABBR command. For more in-
formation about abbreviations, see Adding Commands to the Toolbar.
• Do not begin parameter names with an underscore (_). This convention is reserved for parameters
used by the GUI and ANSYS-supplied macros.
• APDL programmers supporting an organization should consider naming their parameters with a
trailing underscore(_). These can be displayed as a group using the *STATUS command and deleted
from memory as a group through the *DEL command.
• Older ANSYS-supplied macro files may use parameter names that do not begin with an underscore.
Using these macros embedded in your own macros may cause conflicts if the same parameter
names are used.
3.1.1.Hiding Parameters from *STATUS
Listing Parameters (p. 11) discusses listing parameters through the *STATUS command. You can use a
parameter naming convention to "hide" parameters from the *STATUS command. Any parameter whose
name ends in an underscore (_) will not be listed by *STATUS.
Chapter 3:Using Parameters

This capability was added specifically for those who are developing APDL macros for large audiences.
You can use this to build macros that your ANSYS users and other macro programmers cannot list.
3.2.Defining Parameters
Unless otherwise specified, the information in the next several sections applies to both scalar and array
type parameters. Beginning with Array Parameters (p. 18), the information is specific to array type
parameters.
You can either assign values to parameters or retrieve values supplied by ANSYS and store these values
in parameters. For retrieving values from ANSYS, you can use either the *GET command or the various
in-line get functions. The following sections cover these subjects in detail.
3.2.1.Assigning Parameter Values During Execution
You can use the *SET command to define parameters. The following examples illustrate a set of example
parameters defined using *SET:
*SET,ABC,-24
*SET,QR,2.07E11
*SET,XORY,ABC
*SET,CPARM,'CASE1'
You can use an "=" as a shorthand way of calling the *SET command (this is the most convenient
method). The format of the shortcut is Name = Value, where Name is the name assigned to the para-
meter and Value is the numeric or character value stored in that parameter. For character parameters,
the assigned value must be enclosed in single quotes and cannot exceed eight alphanumeric characters.
The following are examples of "=" in use:
ABC=-24
QR=2.07E11
XORY=ABC
CPARM='CASE1'
In the GUI, you can either type the "=" directly in the ANSYS input window or in the "Selection" field
of the Scalar Parameter dialog box (accessed by the Utility Menu> Parameters> Scalar Parameters
menu item).
3.2.2.Assigning Parameter Values At Startup
You can define parameters as arguments when launching ANSYS from the operating system command
line. Simply type parameter definitions after the ANSYS execution command (which is system dependent)
using the format -Name Value. For example, the following defines two parameters (parm1 and parm2)
having the values 89.3 and -0.1:
ansys140 -parm1 89.3 -parm2 -0.1
It is a good practice to avoid assigning one or two character parameter names at startup to avoid
conflicts with ANSYS command line options.
Note
Remember that UNIX shells treat single quotes and many other non-alphanumeric characters
as special symbols. When defining character parameters, you must tell UNIX not to interpret
the quotes by inserting a back slash () before the single quotes. For example, the following
defines two character parameters having the values `filename' and `200.'
9
Defining Parameters

ansys140 -cparm1 'filename' -cparm2 '200'
If you use the ANSYS Launcher to start ANSYS, you can define parameters through the Customization
tab (using the -Name Value format described above).
If you are defining a large number of parameters at startup, you'll find it much more convenient to
define these in the start140.ans file or through a separate file that you can load through the /INPUT
command instead of the command line.
3.2.3.Assigning ANSYS-Supplied Values to Parameters
ANSYS provides two powerful methods for retrieving values:
• The *GET command, which retrieves a value from a specified item and stores it in a specified
parameter.
• The in-line get functions, which can be used in operations. Each get function returns a specific
value from a specific item.
3.2.3.1.Using the *GET Command
The *GET command (Utility Menu> Parameters> Get Scalar Data) retrieves an ANSYS-supplied value
for an item (a node, an element, an area, etc.) and stores it as a user-named parameter. Various keyword,
label, and number combinations identify the retrieved item. For example, *GET,A,ELEM,5,CENT,X returns
the centroid x-location of element 5 and stores the result as parameter A.
The format for the *GET command is:
*GET,Par,Entity,ENTNUM,Item1,IT1NUM,Item2,IT2NUM
where
• Par is the name of the parameter to store the retrieved item.
• Entity is a keyword for the item to be stored. Valid keywords are NODE, ELEM, KP, LINE, AREA,
VOLU, etc. For a complete list of valid keywords, see the *GET description in the Command Reference.
• ENTNUM is the number of the entity (or zero for all entities).
• Item1 is the name of an item for a particular entity. For example, if Entity is ELEM, Item1 will
be either NUM (the highest or lowest element number in the selected set) or COUNT (the number
of elements in the set). (For a complete list of Item1 values for each entity type, see the *GET
description in the Command Reference.)
You can think of the *GET command as a path down a tree structure, from general to specific information.
The following examples show the *GET command in use. The first command below gets the material
attribute (the MAT reference number) of element 97 and assigns it to parameter BCD:
*GET,BCD,ELEM,97,ATTR,MAT ! BCD = Material number of element 97
*GET,V37,ELEM,37,VOLU ! V37 = volume of element 37
*GET,EL52,ELEM,52,HGEN ! EL52 = value of heat generation in element 52
*GET,OPER,ELEM,102,HCOE,2 ! OPER = heat coefficient of element 102,face2
*GET,TMP,ELEM,16,TBULK,3 ! TMP = bulk temperature of element 16,face3
*GET,NMAX,NODE,,NUM,MAX ! NMAX = maximum active node number
*GET,HNOD,NODE,12,HGEN ! HNOD = value of heat generation at node 12
*GET,COORD,ACTIVE,,CSYS ! COORD = active coordinate system number

3.2.3.2.Using In-line Get Functions
For some items, you can use in-line "get functions" in place of the*GET command. A get function returns
a value for an item and uses it directly in the current operation. This process allows you to bypass the
dual steps of storing the value with a parameter name and then entering the parameter name in an
operation. For example, suppose that you want to calculate the average x-location of two nodes. You
could do the following using the *GET function:
1. Issue the following command to assign the x-location of Node 1 to parameter L1.
*GET,L1,NODE,1,LOC,X
2. Issue a second *GET command to assign the x-location of Node 2 to parameter L2.
3. Compute the middle location from MID=(L1+L2)/2.
A shorter method is to use the node location "get function" NX(N), which returns the x-location of node
N. You can use it to calculate the MID location without setting intermediate parameters L1 and L2, as
is shown in the following example:
MID=(NX(1)+NX(2))/2
Get function arguments can themselves be parameters or other get functions. For instance, get function
NELEM(ENUM,NPOS) returns the node number in position NPOS for element ENUM. Combining functions
NX(NELEM(ENUM,NPOS)) returns the x-location of that node.
Get Function Summary summarizes the available get functions.
3.2.4.Listing Parameters
Once you have defined parameters, you can list them using the *STATUS command. If the *STATUS
command is issued without arguments, it provides a list of all of the currently defined parameters. The
following example shows the command and a typical listing.
*STATUS
PARAMETER STATUS- ( 5 PARAMETERS DEFINED)
NAME VALUE TYPE DIMENSIONS
ABC -24.0000000 SCALAR
HEIGHT 57.0000000 SCALAR
QR 2.070000000E+11 SCALAR
X_OR_Y -24.0000000 SCALAR
CPARM CASE1 CHARACTER
You can also access this information through either the Utility Menu> List> Other> Parameters or
Utility Menu> List> Status> Parameters> All Parameters menu items.
Note
Any parameters beginning or ending in an underscore (_) are not shown by the *STATUS
command.
You can check the status of individual parameters by providing these as arguments to the *STATUS
command. The following example shows the status of the ABC parameter.
*STATUS,ABC
PARAMETER STATUS- abc ( 5 PARAMETERS DEFINED)
11
Defining Parameters

ABC -24.0000000 SCALAR
You can also check the status of specific parameters through the Utility Menu> List> Other> Named
Parameter or Utility Menu> List> Status> Parameters> Named Parameters menu items.
3.3.Deleting Parameters
You can delete specific parameters in two ways:
• Issue the "=" command, leaving the right-hand side of the command blank. For example, to delete
the QR parameter issue this command:
QR=
• Issue the *SET command (Utility Menu> Parameters> Scalar Parameters), but don't specify a
value for the parameter. For example, to delete the QR parameter via the *SET command issue the
command as follows:
*SET,QR,
Setting a numeric parameter equal to zero does not delete it. Similarly, setting a character parameter
equal to empty single quotes (` `) or placing blanks within single quotes does not delete the parameter.
3.4.Using Character Parameters
Typically, character parameters are used to provide file names and extensions. The desired file name
can be assigned to a character parameter, and that parameter can be used anywhere a file name is re-
quired. Similarly, a file extension can be assigned to a character parameter and used where appropriate
(typically the Ext command argument). In batch mode, this allows you to easily change file names for
multiple runs by simply changing the initial alphanumeric "value" of the character parameter in your
input file.
Note
Remember that character parameters are limited to a total of eight characters.
The following is a list of general uses for character parameters.
• As arguments to any applicable command field (that is, where alphanumeric input is expected)
• As macro name arguments for the *USE command (Utility Menu> Macro> Execute Data Block)
NAME='MACRO' ! MACRO is the name of a macro file
*USE,NAME ! Calls MACRO
• As arguments to macro calls for *USE and for the "unknown command" macro. Any of the following
macro calls are allowed:
ABC='SX'
*USE,NAME,ABC
or
*USE,NAME,'SX'
DEF='SY'
NEWMACRO,DEF ! Calls existing macro file NEWMACRO.MAC

or
NEWMACRO,'SY'
3.5.Substitution of Numeric Parametric Values
Whenever you use a parameter name in a numeric command field, its value is automatically substituted.
If no value has been assigned to the parameter (that is, if the parameter has not been defined), a near-
zero value (2-100
) will be substituted, usually without warning.
Note
Defining the parameter after it is used in a command does not "update" the command in
most cases. (Exceptions are the commands /TITLE, /STITLE, *ABBR, and /TLABEL. See Forced
Substitution (p. 13) for more information.) For example:
Y=0
X=2.7
N,1,X,Y ! Node 1 at (2.7,0)
Y=3.5 ! Redefining parameter Y now does not update node 1
3.5.1.Preventing Substitution
You can prevent parameter substitution by enclosing the parameter name with single quotes ('), for
example, 'XYZ'. The literal string is then used; therefore, this feature is valid only in non-numerical fields.
Conversely, you can force parameter substitution in titles, subtitles, and filenames by enclosing the
parameter name with percent signs (%). For example,
/TITLE, TEMPERATURE CONTOURS AT TIME=%TM%
specifies a title in which the numerical value of parameter TM is substituted. Note that the parameter
is substituted at the time the title is used.
3.5.2.Substitution of Character Parametric Values
Use of a character parameter in an alphanumeric command field generally results in automatic substi-
tution of its value. Forced substitution and character parameter restrictions are explained below.
3.5.2.1.Forced Substitution
As with numerical parameters, you can force the substitution of a character parameter value in certain
cases where substitution would not occur otherwise. This is done by enclosing the character parameter
name with percent signs (%). Forced substitution of character parameters is valid for the following
commands:
• /TITLE command (Title field). Specifies titles for various printed output.
• /STITLE command (Title field). Specifies subtitles, similar to/TITLE. (You cannot access the /STITLE
command directly in the GUI.)
• /TLABEL command (Text field). Specifies text string for annotation.
• *ABBR command (Abbr field). Defines an abbreviation.
13
Substitution of Numeric Parametric Values

Forced substitution is also valid in the following types of fields:
• Any filename or extension command argument. These arguments apply to commands such as
/FILNAME, RESUME, /INPUT, /OUTPUT, and FILE. (Direct parameter substitution is also valid in
these fields.)
• Any 32 character field: A typical example is the name of macros. (Direct substitution is not valid
for these fields.)
• As a command name in any command name field. Also as an "unknown command" macro name
in field 1. For example:
R='RESUME'
%R%,MODEL,DB
The following example of the command input method shows forced substitution for a subtitle definition
and for a directory name.
A='TEST'
B='.RST'
C='/ANSYS'
D='/MODELS/'
/STITLE,,RESULTS FROM FILE %C%%D%%A%%B%
SUBTITLE 1 =
RESULTS FROM FILE /ANSYS/MODELS/TEST.RST
/POST1
FILE,A,RST,%C%%D% ! Read results from /ANSYS/MODELS/TEST.RST
3.5.2.2.Other Places Where Character Parameters Are Valid
In addition to the more general applications already discussed, there are some specific instances where
character parameters are allowed for added convenience. The commands which are affected and details
of usage are outlined below.
*ASK
This command may prompt you for an alphanumeric string (up to eight characters enclosed in single
quotes) which is assigned to a character scalar parameter. (You cannot access the *ASK command directly
in the GUI.)
*CFWRITE
This command writes ANSYS commands to the file opened by *CFOPEN. It can be used to write a
character parameter assignment to that file. For example, *CFWRITE,B = 'FILE' is valid. (You cannot access
the *CFWRITE and *CFOPEN commands directly in the GUI.)
*IF and *ELSEIF
Character parameters may be used for the VAL1 and VAL2 arguments of these commands. For the
Oper argument, only labels EQ (equal) and NE (not equal) are valid when using character parameters.
(You cannot access the *IF and *ELSEIF commands directly in the GUI.) Example:
CPARM='NO'
*IF,CPARM,NE,'YES',THEN
*MSG
Character parameters are allowed as input for the VAL1 through VAL8 arguments. The data descriptor
%C is used to indicate alphanumeric character data on the format line (which must follow the *MSG
command). The %C corresponds to the FORTRAN descriptor A8. (You cannot access the *MSG command
directly in the GUI.)

PARSAV and PARRES
These commands will save character parameters to a file (PARSAV command or menu path Utility
Menu> Parameters> Save Parameters) and resume character parameters from a file (PARRES or Utility
Menu> Parameters> Restore Parameters).
*VREAD
This command (Utility Menu> Parameters> Array Parameters> Read from File) can be used to read
alphanumeric character data from a file and produce a character array parameter. The FORTRAN character
descriptor (A) may be used in the format line which must follow the *VREAD command.
*VWRITE
This command (menu path Utility Menu> Parameters> Array Parameters> Write to File) can be used
to write character parameter data to a file in a formatted sequence. The FORTRAN character descriptor
(A) may be used in the format line which must follow the *VWRITE command.
3.5.2.3.Character Parameter Restrictions
Although character parameters have much of the same functionality as numerical parameters, there
are several instances where character parameters are not valid.
• Character parameter substitution is not allowed for the Par argument of the *SET, *GET, *DIM,
and *STATUS commands.
• Interactive editing of array parameters (*VEDIT command) is not available for character array
parameters.
• Vector operation commands, such as *VOPER, *VSCFUN, *VFUN, *VFILL, *VGET, and *VITRP, do
not work with character array parameters.
• When operating on character parameters, the specification commands *VMASK and *VLEN are
applicable only to the *VWRITE and *VREAD commands.
• Character parameters are not valid in parametric expressions which use addition, subtraction,
multiplication, etc.
3.6.Dynamic Substitution of Numeric or Character Parameters
Dynamic substitution of parameters will occur for the following commands: /TITLE, /STITLE, *ABBR,
/AN3D, and /TLABEL. Dynamic substitution allows the revised value of a parameter to be used, even
if the command which uses the parameter value has not been reissued.
Example:
XYZ='CASE 1'
/TITLE,This is %XYZ%
APLOT
The title "This is CASE 1" will appear on the area plot.
You can then change the value of XYZ and the new title will appear on subsequent plots, even though
you did not reissue /TITLE.
XYZ='CASE 2'
The title "This is CASE 2" will appear on subsequent plots.
15
Dynamic Substitution of Numeric or Character Parameters

3.7.Parametric Expressions
Parametric expressions involve operations among parameters and numbers such as addition, subtraction,
multiplication, and division. For example:
X=A+B
P=(R2+R1)/2
D=-B+(E**2)-(4*A*C) ! Evaluates to D = -B + E2
- 4AC
XYZ=(A<B)+Y**2 ! Evaluates to XYZ = A + Y2
if A is less than B;
! otherwise to XYZ = B + Y2
INC=A1+(31.4/9)
M=((X2-X1)**2-(Y2-Y1)**2)/2
The following is a complete list of APDL operators:
OperationOperator
Addition+
Subtraction_
Multiplication*
Division/
Exponentiation**
Less-Than Comparison<
Greater-Than Comparison>
You can also use parentheses for clarity and for "nesting" of operations, as shown above. The order in
which the ANSYS program evaluates an expression is as follows:
1. Operations in parentheses (innermost first)
2. Exponentiation (in order, from right to left)
3. Multiplication and division (in order, from left to right)
4. Unary association (such as +A or -A)
5. Addition and subtraction (in order, from left to right)
6. Logical evaluation (in order, from left to right)
Thus an expression such as Y2=A+B**C/D*E will be evaluated in this order: B**C first, /D second, *E
third, and +A last. For clarity, you should use parentheses in expressions such as these. Parentheses can
be nested up to four levels deep, and up to nine operations can be performed within each set of par-
entheses. As a general rule, avoid using blank spaces between operators in expressions. In particular,
never include a blank space before the * character because the rest of the input line (beginning with
the *) will be interpreted as a comment and therefore will be ignored. (Do not use this convention as
a comment; use an exclamation point (!) for this purpose.)
3.8.Parametric Functions
A parametric function is a programmed sequence of mathematical operations which returns a single
value, such as SIN(X), SQRT(B), and LOG(13.2). The following table provides a complete list of functions
currently available in ANSYS.
Absolute value of x.ABS(x)
Absolute value of x with sign of y.y=0 results in positive sign.SIGN(x,y)

Absolute value of the complex number x + yi ( + ¡
¢ ¢
)
CXABS(x,y)
Exponential of x (ex
).EXP(x)
Natural log of x (ln (x)).LOG(x)
Common log of x (log10(x)).LOG10(x)
Square root of x.SQRT(x)
Nearest integer to x.NINT(x)
Remainder of x/y,computed as x - (INT(x/y) * y).y=0 returns zero (0).MOD(x,y)
Random number (uniform distribution) in the range x to y (x = lower bound,y =
upper bound).
RAND(x,y)
Random sample of a Gaussian (normal) distribution with mean x and standard
deviation y.
GDIS(x,y)
Sine,Cosine,and Tangent of x.x is in radians by default,but can be changed to
degrees with *AFUN.
SIN(x),COS(x),
TAN(x)
Hyperbolic sine,Hyperbolic cosine,and Hyperbolic tangent of x.SINH(x),COSH(x),
TANH(x)
Arcsine,Arccosine,and Arctangent of x.x must be between -1.0 and +1.0 for ASIN
and ACOS.Output is in radians by default,but can be changed to degrees with
*AFUN.Range of output is -pi/2 to +pi/2 for ASIN and ATAN,and 0 to pi for ACOS.
ASIN(x),ACOS(x),
ATAN(x)
Arctangentofy/xwiththesignofeachcomponentconsidered.Outputisinradians
by default,but can be changed to degrees with *AFUN.Range of output is -pi to
+pi.
ATAN2(y,x)
Numerical value of CPARM (if CPARM is non-numeric,returns 0.0).VALCHR (CPARM
CharactervalueofnumericalparameterPARM.Numberofdecimalplacesdepends
on magnitude.
CHRVAL (PARM)
Upper case equivalent of CPARM.UPCASE CPARM
Lower case equivalent of CPARM.LWCASE(CPARM)
The following are examples of parametric functions:
PI=ACOS(-1) ! PI = arc cosine of -1, PI calculated to machine accuracy
Z3=COS(2*THETA)-Z1**2
R2=SQRT(ABS(R1-3))
X=RAND(-24,R2) ! X = random number between -24 and R2
*AFUN,DEG ! Units for angular functions are degrees
THETA=ATAN(SQRT(3)) ! THETA evaluates to 60 degrees
PHI=ATAN2(-SQRT(3),-1) ! PHI evaluates to -120 degrees
*AFUN,RAD ! Units for angular functions reset to radians
X249=NX(249) ! X-coordinate of node 249
SLOPE=(KY(2)-KY(1))/(KX(2)-KX(1))
! Slope of line joining keypoints 1 and 2
CHNUM=CHRVAL(X) ! CHNUM = character value of X
UPPER=UPCASE(LABEL) ! UPPER = uppercase character value of parameter LABEL
3.9.Saving,Resuming,and Writing Parameters
If you must use currently defined parameters in another ANSYS session, you can write them to a file
and then read (resume) that file. When you read the file, you can either completely replace currently
defined parameters or add to them (replacing those that already exist).
17
Saving,Resuming,and Writing Parameters

To write parameters to a file, use the PARSAV command (Utility Menu> Parameters> Save Parameters).
The parameters file is an ASCII file consisting largely of APDL *SET commands used to define the various
parameters. The following example shows the format of this file.
/NOPR
*SET,A , 10.00000000000
*SET,B , 254.3948750000
*SET,C ,'string '
*SET,_RETURN , 0.0000000000000E+00
*SET,_STATUS , 1.000000000000
*SET,_ZX ,' '
/GO
To read parameters from a file use the PARRES command (Utility Menu> Parameters> Restore
Parameters)
If you wish, you can write up to ten parameters or array parameters using FORTRAN real formats to a
file. You can use this feature to write your own output file for use in other programs, reports, etc. To
do this, use the *VWRITE command (Utility Menu> Parameters> Array Parameters> Write to File).
The *VWRITE command is discussed in Operations Among Array Parameters (p. 35).
3.10.Array Parameters
In addition to scalar (single valued) parameters, you can define array (multiple valued) parameters.
ANSYS arrays can be
• 1-D (a single column)
• 2-D (rows and columns)
• 3-D (rows, columns, and planes)
• 4-D (rows, columns, planes, and books)
• 5-D (rows, columns, planes, books, and shelves)
ANSYS provides three types of arrays:
ARRAY
This type is similar to FORTRAN arrays and is the default array type when dimensioning arrays. As
with FORTRAN arrays, the indices for rows, columns, and planes are sequential integer numbers
beginning with one. Array elements can be either integers or real numbers.
CHAR
This is a character array, with each element consisting of an alphanumeric value not exceeding eight
characters. The indices for rows, columns, and planes are sequential integer numbers beginning
with one.
TABLE
This is a special type of numeric array which allows ANSYS to calculate (through linear interpolation)
values between these array elements explicitly defined in the array. Moreover, you can define the
array indices for each row, column, and plane and these indices are real (not integer) numbers. Array
elements can be either integers or real numbers. As we'll see in the later discussion on TABLE arrays,
this capability provides a powerful method for describing mathematical functions.
STRING
You can use the *DIM, STRING capability to enter character strings into your arrays. Index numbers
for columns and planes are sequential values beginning with 1. Row indices are determined by the
character position in the string. See the *DIM command for more information.

The following array parameter topics are available:
3.10.1.Array Parameter Basics
3.10.2.Array Parameter Examples
3.10.3.TABLE Type Array Parameters
3.10.4.Defining and Listing Array Parameters
3.10.5.Specifying Array Element Values
3.10.6.Writing Data Files
3.10.7.Operations Among Array Parameters
3.10.8.Plotting Array Parameter Vectors
3.10.9.Modifying Curve Labels
3.10.1.Array Parameter Basics
Consider a 2-D array (either ARRAY or CHAR) as shown below. It is m rows long and n columns wide;
that is, its dimensions are m times n. Each row is identified by a row index number i, which varies from
1 to m, and each column is identified by a column index number j, which varies from 1 to n. The
quantities that make up the array are array elements. Each array element is identified as (i,j), where
i is its row index number and j is its column index number.
Figure 3.1 A Graphical Representation of a 2-D Array
We can extend these definitions to a 3-D array parameter, which may be m rows long, n columns wide,
and p planes deep. The plane index number is k, which varies from 1 to p. Each array element is iden-
tified as (i,j,k,). The following figure shows a 3-D array.
19
Array Parameters

Row
Column
Plane 1
Plane 2
Plane 3
Row
Column
Plane 1
Plane 2
Plane 3Book 1
4-D
Row
Column
Plane 1
Plane 2
Plane 3
Row
Column
Plane 1
Plane 2
Plane 3Book 2
4-D
5-D Shelf 1
3.10.2.Array Parameter Examples
Type ARRAY parameters consist of discrete numbers that are simply arranged in a tabular fashion for
convenience. Consider the following examples.

The parameter NTEMP could be an array of temperatures at selected nodes; NTEMP(1) = -47.6 could be
the temperature at node 27, NTEMP(2) = -5.2 could be the temperature at node 43, and so on. Similarly,
EVOLUM could be an array of element volumes, and COMPSTRS could be an array of nodal component
stresses, with each column representing a particular direction (X, Y, Z, XY, YZ, XZ, for example).
A type CHAR array parameter is structured similarly to an ARRAY parameter, with the tabular values
being alphanumeric character strings (up to eight characters). Two examples of character array parameters
are:
3.10.3.TABLE Type Array Parameters
A type TABLE array parameter consists of numbers (alphanumeric values are not valid) arranged in a
tabular fashion, much like the ARRAY type. However, there are three important differences
• ANSYS can calculate (through linear interpolation) any values that fall between the explicitly declared
array element values.
• A table array contains a 0 row and 0 column used for data-access index values, and unlike standard
arrays, these index values can be real numbers. The only restriction is that the index values must
be numerically increasing (never decreasing) numbers. You must explicitly declare a data access
index value for each row and column; otherwise the default value assigned is the "tiny number"
(7.888609052E-31).
You can more conveniently define the index starting point and index values via the *TAXIS
command.
• A plane index value resides in the 0,0 location for each plane.
The following figure shows a TABLE array with data-access index values. Note that the indexes are
specified as the "0" row and column values.
21
Array Parameters

Figure 3.4 A Graphical Representation of a Table Array
As shown in the above example, when configuring a table array you must set
• The plane index value as the 0,0 element value for each plane.
• The data-access column index values in the elements in the 0 row in plane 1. Only the column index
values from plane 1 are used when accessing data from the array for all planes. When setting the
array element values, you use the traditional row and column index numbers.
• The data-access row index values in the elements in the 0 column in plane 1. Only the row index
values from plane 1 are used when accessing data from the array for all planes. When setting the
array element values, you use the traditional row and column index numbers.
3.10.4.Defining and Listing Array Parameters
To define an array parameter, you must first declare its type and dimensions using the *DIM command
(Utility Menu> Parameters> Array Parameters> Define/Edit).
This following examples illustrate the *DIM command used to dimension various types of arrays:
*DIM,AA,,4 ! Type ARRAY is default, dimension 4[x1x1]
*DIM,XYZ,ARRAY,12 ! Type ARRAY array, dimension 12[x1x1]
*DIM,FORCE,TABLE,5 ! Type TABLE array, dimension 5[x1x1]
*DIM,T2,,4,3 ! Dimensions are 4x3[x1]
*DIM,CPARR1,CHAR,5 ! Type CHAR array, dimension 5[x1x1]
Note
Array elements for ARRAY and TABLE are initialized to 0 (except for the 0 row and column
for TABLE, which is initialized to the tiny value). Array elements for CHAR are initialized to a
blank value.
For array parameter operations (for example *VOPER, *VFUN), the resulting array parameter (ParR)
need not be dimensioned beforehand. Also, array parameters defined completely with the implied
(colon) loops convention (for example a(1:5)=10,20,30,40,50) need not be dimensioned beforehand.

The next example shows how to fill a 5-D array with data. Use 1-D tables to load a 5-D table. Use the
*TAXIS to define the table index values. See the full example at Example Analysis Using 5-D Table Array.
*dim,xval,array,X1
*dim,yval,array,Y1
yval(1)=0,20
*dim,zval,array,10
zval(1)=10,20,30,40,50,60,70,80,90,100
*dim,tval,array,5
tval(1)=1,.90,.80,.70,.60
*dim,tevl,array,5
tevl(1)=1,1.20,1.30,1.60,1.80
*dim,ccc,tab5,X1,Y1,Z1,D4,D5,X,Y,Z,TIME,TEMP
*taxis,ccc(1,1,1,1,1),1,0,wid !!! X-Dim
*taxis,ccc(1,1,1,1,1),2,0,hth !!! Y-Dim
*taxis,ccc(1,1,1,1,1),3,1,2,3,4,5,6,7,8,9,10 !!! Z-Dim
*taxis,ccc(1,1,1,1,1),4,0,10,20,30,40 !!! Time
*taxis,ccc(1,1,1,1,1),5,0,50,100,150,200 !!! Temp
*do,ii,1,2
*do,jj,1,2
*do,kk,1,10
*do,ll,1,5
*do,mm,1,5
ccc(ii,jj,kk,ll,mm)=(xval(ii)+yval(jj)+zval(kk))*tval(ll)*tevl(mm)
*enddo
*enddo
*enddo
*enddo
*enddo
3.10.5.Specifying Array Element Values
You can specify array element values by
• Setting individual array element values through the *SET command or "=" shortcut.
• Filling individual vectors (columns) in the array with either specified or calculated values (the *VFILL
command, for example).
• Interactively specifying values for the elements through the *VEDIT dialog box.
• Reading the values from an ASCII file (*VREAD or *TREAD commands).
Note
You cannot create or edit 4- or 5-D arrays interactively. *VEDIT, *VREAD, and *TREAD
are not applicable to 4- or 5-D arrays.
3.10.5.1.Specifying Individual Array Values
You can use either the *SET command or the "=" shortcut. Usage is the same as for scalar parameters,
except that you now define a column of data (up to ten array element values per "=" command). For
example, to define the parameter XYZ dimensioned above as a 12x1 array you will need two "=" com-
mands. In the following example the first command defines the first eight array elements and the second
command defines the next four array elements:
XYZ(1)=59.5,42.494,-9.01,-8.98,-8.98,9.01,-30.6,51
XYZ(9)=-51.9,14.88,10.8,-10.8
23
Array Parameters

Notice that the starting location of the array element is indicated by the row index number of the
parameter (1 in the first command, 9 in the second command).
The following example shows how to define the element values for the 4x3 array parameter T2, dimen-
sioned earlier in the *DIM examples:
T2(1,1)=.6,2,-1.8,4 ! defines (1,1),(2,1),(3,1),(4,1)
T2(1,2)=7,5,9.1,62.5 ! defines (1,2),(2,2),(3,2),(4,2)
T2(1,3)=2E-4,-3.5,22,.01 ! defines (1,3),(2,3),(3,3),(4,3)
The following example defines element values for the TABLE array parameter FORCE discussed earlier.
FORCE(1)=0,560,560,238.5,0
FORCE(1,0)=1E-6,.8,7.2,8.5,9.3
The first “=” command defines the five array elements of the TABLE array FORCE. The second and third
“=” commands redefine the index numbers in the j=0 and i=0 row.
Character array parameters can also be defined using the "=" command. Assigned values can be up to
eight characters each and must be enclosed in single quotes. For example:
*DIM,RESULT,CHAR,3 !Character array parameter with dimensions (3,1,1)
RESULT(1)='SX','SY','SZ' !Assigns values to parameter RESULT
Notice that, as when defining a numerical array parameter, the starting location of the array element
must be specified (in this case, the row index number 1 is indicated).
Note
CHAR cannot be used as a character parameter name because it will create a conflict with
the CHAR label on the *DIM command. ANSYS will substitute the character string value as-
signed to parameter CHAR when CHAR is input on the third field of the *DIM command
(Type field).

3.10.5.2.Filling Array Vectors
You can use the *VFILL command (Utility Menu> Parameters> Array Parameters> Fill) to "fill" an
ARRAY or TABLE vector (column).
See the *VFILL command reference information in the Command Reference for more detail about the
command syntax. The following example illustrates the capabilities of the *VFILL command.
*DIM,DTAB,ARRAY,4,3 ! dimension 4 x 3 numeric array
*VFILL,DTAB(1,1),DATA,-3,8,-12,57 ! four data values loaded into vector 1
*VFILL,DTAB(1,2),RAMP,2.54,2.54 ! fill vector 2 with values starting at
! 2.54 and incrementing by 2.54
*VFILL,DTAB(1,3),RAND,1.5,10 ! fill vector 3 with random numbers between
! 1.5 and 10. Results will vary due to
! random number generation.
3.10.5.3.Interactively Editing Arrays
The *VEDIT command (Utility Menu> Parameters> Array Parameters> Define/Edit), which is available
only in interactive mode, launches a data entry dialog box you can use to edit an ARRAY or TABLE (not
CHAR) array. The dialog box provides a number of convenient features:
• A spreadsheet-style editor for array element values.
• Navigational controls for scrolling through large arrays.
• An initialize function to set any row or column to a specified value (ARRAY type only).
• Delete, copy, and insert functions for moving rows or columns of data (ARRAY type only).
Complete instructions for using the dialog box are available from the box's Help button.
Note
You cannot edit a 4- or 5-D ARRAY or TABLE interactively.
Figure 3.5 An Example *VEDIT Dialog Box for an ARRAY
25
Array Parameters

Figure 3.6 An Example *VEDIT Dialog Box for a TABLE
3.10.5.4.Filling an Array From a Data File Using *VREAD
You can fill an array from a data file using the *VREAD command (Utility Menu> Parameters> Array
Parameters> Read from File). The command reads information from an ASCII data file and begins
writing it into the array, starting with the index location that you specify. You can control the format
of the information read from the file through data descriptors. The data descriptors must be enclosed
in parenthesis and placed on the line following the *VREAD command. See Vector Operations (p. 35)
for more information about data descriptors. The data descriptors control the number of fields to be
read from each record, the width of the data fields, and the position of the decimal point in the field.
For example, given the following data file named dataval:
1.5 7.8 12.3
15.6 -45.6 42.5
and an array called EXAMPLE that has been dimensioned as 2 x 3, the following commands (provided
as either a part or a macro or input listing)
*DIM,EXAMPLE,,2,3
*VREAD,EXAMPLE(1,1),dataval,,,JIK,3,2
(3F6.1)
result in
1.5 7.8 12.3
15.6 -45.6 42.5EXAMPLE =
The *VREAD command cannot be issued directly from the command input window. However, the
Utility Menu> Parameters> Array Parameters> Read from File dialog box offers a way to specify the
data descriptors and issue the command in interactive mode.
Note
You cannot fill a 4- or 5-D array using *VREAD.
3.10.5.5.Filling a TABLE Array From a Data File Using *TREAD
Once configured, you have two options for specifying values for the TABLE array elements: you can add
values as you would for any other type of array, or you can read in a table of data from an external file.

To read in a table of data from an external file, you still define the TABLE array first, specifying the
number of rows, columns, and planes, and the labels for each. You can then read an ASCII file containing
the table of data using the *TREAD command (Utility Menu> Parameters> Array Parameters> Read
from File). At this time, you also specify the number of lines to skip (NSKIP) between the top of the file
and the first line of the table.
When reading data from an external file, remember:
• The file containing the table of data can be created in a text editor or an external application (such
as Microsoft Excel), but it must be in ASCII form, tab-delimited, to be read into ANSYS.
• You must first define the array in ANSYS, remembering to allow for the index values (0,0).
• The values are read straight across the rows until all columns on each row of the array are filled;
ANSYS then wraps from one row to the next and begins to fill those columns, and so on. Be sure
that the dimensions of the array you defined are correct. If you mistakenly define fewer columns
in the ANSYS array than required, ANSYS will start filling in the next row of the array using the
values remaining in the first row of the data table being read. Similarly, if you define more columns
in the ANSYS array than required, ANSYS will fill all columns of the array using values from the next
row of the data table being read, and only then wrap and begin filling the next row.
You can create 1-D, 2-D, and 3-D tables by reading data from an external file. Examples of how you
create each of these follows.
Note
You cannot fill a 4- or 5-D TABLE using *TREAD.
Example 1: 1-D Table
First, create the 1-D table using the application of your choice (such as a spreadsheet application, a text
editor, etc.) and then save the file as a text file in tab-delimited format. In this example, the table is
named "Tdata" and contains data for time vs. temperature. In its ASCII form, the table would look like
this:
Time Temperature Table
TempTime
200
301
702
754
In ANSYS, you define a TABLE parameter "Tt" using the *DIM command (Utility Menu> Parameters>
Array Parameters> Define/Edit). Specify 4 rows and 1 column, row label of Time, and column label
of Temp. Note that the data table you created has four rows and one column of data, plus the row and
column index values (the first column - TIME - is the row index values) Then read in the file as described
earlier, specifying 2 skipped lines. The TABLE array in ANSYS would look like this:
27
Array Parameters

Figure 3.7 A Sample 1-D TABLE Array Dialog Box
This same example, done via command input, would look like the following:
*DIM,Tt,table,4,1,1,TIME,TEMP
*TREAD,Tt,tdata,txt,,2
For this example, create (in a spreadsheet application, a text editor, etc.) a 2-D table named "T2data"
containing temperature data as a function of time and x-coordinate and read it into a TABLE array
parameter called "Ttx." The table, in its ASCII form, would look like this:
Temp (time-X-coord) Table
X-CoordinateTime
.9.7.5.300
30252015100
40352520151
60553525202
100907040304
In ANSYS, you define a TABLE parameter "Ttx" using the *DIM command (Utility Menu> Parameters>
Array Parameters> Define/Edit). Specify 4 rows, 5 columns, 1 plane, row label of TIME, and column
label of X-COORD. Note that the data table you created has four rows and five columns of data, plus
the row and column index values. Then read in the file as described earlier, specifying 2 skipped lines.
The TABLE array in ANSYS would look like this:

*DIM,Ttx,table,4,5,,time,X-COORD
*TREAD,Ttx,t2data,txt,,2
For this example, create a 3-D table named "T3data" containing temperature data as a function of time,
x-coordinate, and y-coordinate and read it into a TABLE array parameter called "Ttxy." The table, in its
ASCII form, would look like this:
Temp (time-X-coord) Table
X-CoordinateTime
.9.7.5.300
30252015100
40352520151
60553525202
100907040304
.9.7.5.301.5
40353025200
50453530251
70654535302
1201008050404
In the example above, the bold values (in the (0,0,Z) positions) indicate the separate planes. Each plane
of data, along with the row and column index values, is repeated for the separate planes. Only the
plane index value and the actual data values are different. The shaded area above shows the values
that change from plane to plane.
In ANSYS, you define a TABLE parameter "Ttxy" using the *DIM command (Utility Menu> Parameters>
Array Parameters> Define/Edit). In the case of a 3-D table, the table is dimensioned according to the
number of rows, columns, and planes of data. The first column (TIME) is the row index values and the
first row is the column index values. Specify 4 rows, 5 columns, 2 planes, row label of TIME, column label
of X-COORD, and plane label of Y-COORD. Note that the data table you created has four rows and five
columns of data in two planes, plus the row and column index values. Then read in the file as described
29
Array Parameters

earlier, specifying 2 skipped lines. The TABLE array in ANSYS would look like this for the second plane
of data (Y=1.5):
*DIM,Ttxy,table,4,5,2,TIME,X-COORD,Y-COORD
*TREAD,Ttxy,t3data,txt,,2
3.10.5.6.Interpolating Values
When accessing information from the array, ANSYS will interpolate values between those explicitly set.
As examples of how ANSYS interpolates values in TABLE arrays, consider the following:
Given that A is a TABLE array parameter, the ANSYS program can calculate any value between A(1) and
A(2), for example
• A(1.5) evaluates to 20.0 (halfway between 12.0 and 28.0)
• A(1.75) evaluates to 24.0
• A(1.9) evaluates to 26.4
Similarly, if PQ is a TABLE array parameter
• PQ(1.5,1) evaluates to -3.4 (halfway between 2.8 and -9.6)
• PQ(1,1.5) evaluates to 3.5 (halfway between 2.8 and 4.2)
• PQ(3.5,1.3) evaluates to 14.88
This feature allows you to describe a function, such as y=f(x), using a TABLE array parameter. You would
use the j=0 column for values of the independent variable x and the "regular" j=1 column for values of
y. Consider, for example, a time-history forcing function described by five points as shown below.

Figure 3.10 Time-History Forcing Function
You can specify this function as a TABLE array parameter whose array elements are the force values,
and whose row index numbers 1 through 5 are time values 0.0 through 9.3. Schematically, the parameter
will then look like this:
ANSYS can calculate (through linear interpolation) force values at times not specified in the FORCE
parameter. For the above example, ANSYS will calculate a value of 89.4375 for FORCE(9). If a parameter
location beyond the dimensions of the array is used, no extrapolation is done and the end value is
used. For example, ANSYS will provide a value of 560.0 for FORCE(5,2) or 0.0 for FORCE(12)
You can see from these examples that TABLE array parameters can be very powerful tools in your ana-
lysis. Typical applications are time-history loading functions, response spectrum curves, stress-strain
curves, material-versus- temperature curves, B-H curves for magnetic materials, and so forth. Be aware
that TABLE array parameters require more computer time to process than the ARRAY type.
3.10.5.7.Retrieving Values into or Restoring Array Parameter Values
You can use the *VGET command (Utility Menu> Parameters> Get Array Data), which is similar to
*GET, to retrieve ANSYS supplied values and store them in an array.
You must define a starting array location number for the array parameter the *VGET command creates.
Looping continues over successive entity numbers for the KLOOP default. For example,
*VGET,A(1),ELEM,5,CENT,X returns the centroid x-location of element 5 and stores the result in the first
location of A. Retrieving continues with elements 6, 7, and so on until successive array locations are
filled. In this example, if KLOOP is 4, then the centroid of x, y, and z are returned.
To restore array parameter values, use the *VPUT command (Utility Menu> Parameters> Array Oper-
ations> Put Array Data).
The *VPUT command uses the same arguments as the *VGET command (described above), but does
the opposite of the *VGET operation. For a list of valid labels for *VPUT items, see the command's de-
scription in the Command Reference.
The ANSYS program "puts" vector items directly, without any coordinate system transformation. *VPUT
can replace existing array items, but can't create new items. Degree of freedom results that are changed
31
Array Parameters

in the database are available for all subsequent operations. Other results change temporarily, and are
available mainly for immediately following print and display operations.
Note
Use this command with extreme caution, as it can alter entire sections of the database. The
*VPUT command doesn't support all items on the *VGET item list because putting values
into some locations could make the ANSYS database inconsistent.
3.10.5.8.Listing Array Parameters
As with scalar parameters, you can use the *STATUS command to list array parameters. The following
examples illustrate the *STATUS command in use:
*STATUS
ABBREVIATION STATUS-
ABBREV STRING
SAVE_DB SAVE
RESUM_DB RESUME
QUIT Fnc_/EXIT
POWRGRPH Fnc_/GRAPHICS
ANSYSWEB Fnc_HomePage
PARAMETER STATUS- ( 5 PARAMETERS DEFINED)
(INCLUDING 2 INTERNAL PARAMETERS)
MYCHAR hi CHARACTER
MYPAR ARRAY 4 6 1
MYPAR1 .987350000 SCALAR
*STATUS,XYZ(1),5,9 ! Lists rows 5 through 9 of XYZ
PARAMETER STATUS- XYZ ( 4 PARAMETERS DEFINED)
LOCATION VALUE
5 1 1 -8.98000000
6 1 1 9.01000000
7 1 1 -30.6000000
8 1 1 51.0000000
9 1 1 -51.9000000
*STATUS,FORCE(1),,,0 ! Lists parameter FORCE, includes j=0 column
PARAMETER STATUS- FORCE ( 4 PARAMETERS DEFINED)
LOCATION VALUE
1 0 1 0.000000000E+00
2 0 1 0.800000000
3 0 1 7.20000000
4 0 1 8.50000000
5 0 1 9.30000000
1 1 1 0.000000000E+00
2 1 1 560.000000
3 1 1 560.000000
4 1 1 238.500000
5 1 1 0.000000000E+00
*STATUS,T2(1,1) ! Lists parameter T2
PARAMETER STATUS- T2 ( 4 PARAMETERS DEFINED)
LOCATION VALUE
1 1 1 0.600000000
2 1 1 2.00000000
3 1 1 -1.80000000
4 1 1 4.00000000
1 2 1 7.00000000

2 2 1 5.00000000
3 2 1 9.10000000
4 2 1 62.5000000
1 3 1 2.000000000E-04
2 3 1 -3.50000000
3 3 1 22.0000000
4 3 1 1.000000000E-02
*STATUS,RESULT(1)!Lists parameter RESULT
PARAMETER STATUS- RESULT ( 4 PARAMETERS DEFINED)
LOCATION VALUE
1 1 1 SX(CHAR)
2 1 1 SY(CHAR)
3 1 1 SZ(CHAR)
3.10.6.Writing Data Files
You can write formatted data files (tabular formatting) from data held in arrays through the *VWRITE
command. The command takes up to 10 array vectors as arguments and writes the data contained in
those vectors to the currently open file (*CFOPEN command). The format for each vector is specified
with FORTRAN data descriptors on the line following the *VWRITE command (therefore you can't issue
the *VWRITE command from the ANSYS input window.)
An array vector, specified with a starting element location (such as MYARRAY(1,2,1)). You can also use
an expression, which is evaluated as a constant value for that field in each row of the data file. The
keyword SEQU evaluates to a sequential column of integers, starting from one.
The format of each row in the data file is determined by the data descriptor line. You must include one
descriptor for each argument to the command. Do not include the word FORMAT in the descriptor line.
You can use any real format or character format descriptor; however, you may not use either integer
or list directed descriptors.
3.10.6.1.Format Data Descriptors
If you aren't familiar with FORTRAN data descriptors, this section will get you started with formatting
your data file. For more information, consult the documentation for the FORTRAN compiler for you
particular platform.
You must provide a data descriptor for each data item you specify as an argument to the *VWRITE
command. In general, you can use the F descriptor (floating point) for any numeric values. The F
descriptor takes the syntax
Fw.d
where
w
Is the width of the data field in characters.
d
Is the number of digits to the right of the decimal point.
Thus, for a field that is 10 characters wide and has eight characters after the decimal point, you would
use the following data descriptor:
F10.8
33
Array Parameters

For character fields, you can use the A descriptor. The A descriptor has the syntax
Aw
where
w
Is the width of the data field in characters.
Thus, for a character field that is eight characters wide, the descriptor is
A8
The following examples illustrate the *VWRITE command and data descriptors in use.
Given that the MYDATA array has been dimensioned and filled with the following values:
The following short macro first defines the scalar parameter X as having a value of 25 and then opens
the file vector (*CFOPEN command). The *VWRITE command then defines the data to be written to
the file. In this case, the first vector written uses the SEQU keyword to provide row numbers. Note that
in some cases that constants, scalar parameters, and operations that include array element values are
written to the file. Note the data file contents for these items.
x=25
*cfopen,vector
*vwrite,SEQU,mydata(1,1,1),mydata(1,2,1),mydata(1,3,1),10.2,x,mydata(1,1,1)+3
(F3.0,' ',F8.4,' ',F8.1,' 'F8.6,' ',F4.1,' 'F4.0,' 'F8.1)
*cfclos
The macro creates the following data file:
1. 2.1522 3.9 5.286370 10.2 25. 5.2
2. 2.3049 4.0 5.409196 10.2 25. 5.2
3. 2.0105 3.4 5.936638 10.2 25. 5.2
4. 2.3683 3.3 5.632203 10.2 25. 5.2
5. 2.8491 4.8 5.978024 10.2 25. 5.2
6. 2.2280 3.5 5.546851 10.2 25. 5.2
The second example uses the following previously dimensioned and filled array:
Note the use of descriptors in the following example *VWRITE command:
*vwrite,SEQU,mydata(1,1),mydata(1,2),(mydata1(1,1)+mydata1(1,2))
(' Row',F3.0,' contains ',2F7.3,'. Is their sum ',F7.3,' ?')
The resulting data file is
Row 1. contains 10.000 50.000. Is their sum 60.000 ?

3.10.7.Operations Among Array Parameters
Just as parametric expressions and functions allow operations among scalar parameters, a series of
commands is available to perform operations among array parameters. There are classes of operations:
operations on columns (vectors), known as vector operations and operations on entire matrices (arrays),
known as matrix operations. All operations are affected by a set of specification commands, which are
discussed in Specification Commands for Vector and Matrix Operations (p. 39).
3.10.7.1.Vector Operations
Vector operations are simply a set of operations - addition, subtraction, sine, cosine, dot product, cross
product, etc. - repeated over a sequence of array elements. Do-loops (discussed in Looping: Do-Loops)
can be employed for this purpose, but a more convenient and much faster way is to use the vector
operation commands - *VOPER, *VFUN, *VSCFUN, *VITRP, *VFILL, *VREAD, and *VGET. Of these listed
vector operation commands, only *VREAD and *VWRITE are valid for character array parameters. Other
vector operation commands apply only to array parameters dimensioned (*DIM) as ARRAY type or
TABLE type.
The *VFILL, *VREAD, *VGET, *VWRITE, and *DIM commands were introduced earlier in this chapter.
Other commands that are discussed in this section include
*VOPER or Utility Menu> Parameters> Array Operations> Vector Operations
Performs an operation on two input array vectors and produces a single output array vector.
*VFUN or Utility Menu> Parameters> Array Operations> Vector Functions
Performs a function on a single input array vector and produces a single output array vector.
*VSCFUN or Utility Menu> Parameters> Array Operations> Vector-Scalar Func
Determines the properties of a single input array vector and places the result in a specified scalar
parameter.
*VITRP or Utility Menu> Parameters> Array Operations> VectorInterpolate
Forms an array parameter (type ARRAY) by interpolating an array parameter (type TABLE) at specified
table index locations.
The examples below illustrate the use of some of these commands. Refer to the Command Reference
for syntactical information about these commands. For all of the following examples, the array parameters
(of type ARRAY) X, Y, and THETA have been dimensioned and defined.
In the following example, the result array is first dimensioned (Z1). The *VOPER command then adds
column 2 of X to column 1 of Y, both starting at row 1, and then places the result into Z1. Notice that
the starting location (the row and column index numbers) must be specified for all array parameters.
The operation then progresses sequentially down the specified vector.
35
Array Parameters

*DIM,Z1,ARRAY,4
*VOPER,Z1(1),X(1,2),ADD,Y(1,1)
In the following example, again the result array (Z2) is dimensioned first. The *VOPER command then
multiplies the first column of X (starting at row 2) with the fourth column of Y (starting at row 1) and
writes the results to Z2 (starting at row 1).
*DIM,Z2,ARRAY,3
*VOPER,Z2(1),X(2,1),MULT,Y(1,4)
In this example, again the results array (Z4) is dimensioned first. The *VOPER command then performs
the cross product of four pairs of vectors, one pair for each row of X and Y. The i, j, and k components
of these vectors are columns 1, 2, and 3 respectively of X and columns 2, 3, and 4 of Y. The results are
written to Z4, whose i, j, and k components are vectors 1, 2, and 3 respectively.
*DIM,Z4,ARRAY,4,3
*VOPER,Z4(1,1),X(1,1),CROSS,Y(1,2)
In the following example, the results array (A3) is dimensioned first. The *VFUN command then raises
each element in vector 2 of X to the power of 2 and writes the results to A3.
*DIM,A3,ARRAY,4
*VFUN,A3(1),PWR,X(1,2),2
In this example, the results array (A4) is dimensioned. The two *VFUN commands then calculate the
cosine and sine of array elements in THETA and place the results in the first and second columns, re-
spectively, of A4. Notice that A4 now represents a circular arc spanning 90°, described by seven points
(whose x, y, and z global Cartesian coordinates are the three vectors). The arc has a radius of 1.0 and
lies parallel to the x-y plane at z = 2.0.
*DIM,A4,ARRAY,7,3
*AFUN,DEG
*VFUN,A4(1,1),COS,THETA(1)
*VFUN,A4(1,2),SIN,THETA(1)
A4(1,3)=2,2,2,2,2,2,2

In this example, the results array (A5) is first dimensioned. Then, the *VFUN command calculates the
tangent vector at each point on the curve represented by A4, normalizes it to 1.0, and places the results
in A5.
*DIM,A5,ARRAY,7,3
*VFUN,A5(1,1),TANG,A4(1,1)
Two additional *VOPER operations, gather (GATH) and scatter (SCAT), are used to copy values from
one vector to another based on numbers contained in a "position" vector. The following example
demonstrates the gather operation. Note that, as always, the results array must be dimensioned first.
In the example, the gather operation copies the value of B1 to B3 (using the index positions specified
in B2). Note that the last element in B3 is 0 as this is its initialized value.
*DIM,B1,,4
*DIM,B2,,3
*DIM,B3,,4
B1(1)=10,20,30,40
B2(1)=2,4,1
*VOPER,B3(1),B1(1),GATH,B2(1)
3.10.7.2.Matrix Operations
Matrix operations are mathematical operations between numerical array parameter matrices, such as
matrix multiplication, calculating the transpose, and solving simultaneous equations.
Commands discussed in this section include
*MOPER or Utility Menu> Parameters> Array Operations> Matrix Operations
Performs matrix operations on two input array parameter matrices and produces one output array
parameter matrix. Matrix operations include:
• Matrix multiplication
• Solution of simultaneous equations
• Sorting (in ascending order) on a specified vector in a matrix
• Covariance between two vectors
• Correlation between two vectors
37
Array Parameters

*MFUN or Utility Menu> Parameters> Array Operations> Matrix Functions
Copies or transposes an array parameter matrix (accepts one input matrix and produces one output
matrix).
*MFOURI or Utility Menu> Parameters> Array Operations> Matrix Fourier
Calculates the coefficients for or evaluates a Fourier series.
The examples below illustrate the use of some of these commands. Refer to the Command Reference
for syntactical information about these commands.
This example shows the sorting capabilities of the *MOPER command. For this example, assume that
the array (SORTDATA) has been dimensioned and its element values have been defined as follows:
First, the OLDORDER array is dimensioned. The *MOPER command will place the original order of the
rows into OLDORDER. The *MOPER command then sorts the rows in SORTDATA so that the 1,1 vector
is now in ascending order.
*dim,oldorder,,5
*moper,oldorder(1),sortdata(1,1),sort,sortdata(1,1)
The following array values result from the *MOPER command:
To put the SORTDATA array back into its original order, you could then issue the following command:
*moper,oldorder(1),sortdata(1,1),sort,oldorder(1,1)
In the following example, the *MOPER command solves a set of simultaneous equations. The following
two arrays have been dimensioned and their values assigned:
The *MOPER command can solve a set of simultaneous equations for a square matrix. The equations
take the form
an1X1 + an2X2 + , . . . , + annXn = bn
In the case of the above arrays, the *MOPER command will solve the following set of simultaneous
equations:
2X1 + 4X2 + 3X3 +2X4 = 2
3X1 + 6X2 + 5X3 + 2X4 = 2

2X1 + 5X2 + 2X3 - 3X4 =3
4X1 + 5X2 +14X3 + 14X4 = 11
To solve the equations, first the results array (C) is dimensioned. Then the *MOPER command solves
the equations, using A as the matrix of a coefficients and B as a vector of b values.
*DIM,C,,4
*MOPER,C(1),A(1,1),SOLV,B(1)
The C array now contains the following solutions.
The following example shows the *MFUN command used to transpose data in an array. For this example,
assume that the array (DATA) was dimensioned and filled with the following values:
As always, the results array (DATATRAN) is dimensioned first, then the *MFUN command transposes
the values and writes them to DATATRAN.
*DIM,DATATRAN,,2,3
*MFUN,DATATRAN(1,1),TRAN,DATA(1,1)
The following shows the results in the DATATRAN array:
3.10.7.3.Specification Commands for Vector and Matrix Operations
All the vector and matrix operation commands are affected by the setting of the following specification
commands: *VCUM, *VABS, *VFACT, *VLEN, *VCOL, and*VMASK. (Of all specification commands, only
*VLEN and *VMASK, in conjunction with *VREAD or *VWRITE, are valid for character array parameters.)
You can check the status of these commands with the *VSTAT command. Most of these commands
(and their corresponding GUI paths) were introduced earlier in this chapter. The others are explained
in the following.
With the exception of the *VSTAT command, which you cannot access directly in the GUI, all of the
specification commands described below are available via menu path Utility Menu> Parameters> Array
Operations> Operation Settings.
Important: All specification commands are reset to their default settings after each vector or matrix
operation.
The following lists the available array specification commands:
*VCUM
Specifies whether results will be cumulative or noncumulative (overwriting previous results). ParR,
the result of a vector operation, is either added to an existing parameter of the same name or
39
Array Parameters

overwritten. The default is noncumulative results, that is, ParR overwrites an existing parameter of
the same name.
*VABS
Applies an absolute value to any or all of the parameters involved in a vector operation. The default
is to use the real (algebraic) value.
*VFACT
Applies a scale factor to any or all of the parameters involved in a vector operation. The default
scale factor is 1.0 (full value).
*VCOL
Specifies the number of columns in matrix operations. The default is to fill all locations of the result
array from the specified starting location.
*VSTAT
Lists the current specifications for the array parameters.
*VLEN or Utility Menu> Parameters> Array Operations> Operation Settings
Specifies the number of rows to be used in array parameter operations.
*VMASK or Utility Menu> Parameters> Array Operations> Operation Settings
Specifies an array parameter as a masking vector.
The following table lists the various specification commands and the vector and matrix array commands
that they affect.
*VMASK*VLEN,NROW,NINC*VCOL*VCUM*VFACT*VABS
NoNoNoNoNoNoNo*MFOURI
YesNoYesNoYesYesYes*MFUN
YesNoYesNoYesYesYes*MOPER
YesYesYesN/AYesYesYes*VFILL
YesYesYesN/AYesYesYes*VFUN
YesYesYesN/AYesYesYes*VGET
YesYesYesN/AYesYesYes*VITRP
YesYesYesN/AYesYesYes*VOPER
YesYesYesN/AN/ANoNoVPLOT
YesYesYesN/ANoYesYes*VPUT
YesYesYesN/AYesYesYes*VREAD
YesYesYesN/AYesYesYes*VSCFUN
YesYesYesN/AN/ANoNo*VWRITE
The examples below illustrate the use of some of the specification commands. Refer to the Command
Reference for syntactical information about these commands.
In the following, the results array (CMPR) is dimensioned. The two *VFUN commands, in conjunction
with the preceding *VMASK and *VLEN commands, then compress selected data and write them to
specified locations in CMPR. The complement to the COMP operation is the EXPA operation on the
*VFUN command.
*DIM,CMPR,ARRAY,4,4
*VLEN,4,2! Do next *V---- operation on four rows,
! skipping every second row
*VFUN,CMPR(1,2),COMP,Y(1,1)

*VMASK,X(1,3)!Use column 3 of X as a mask for next *V----
! operation
*VFUN,CMPR(1,3),COMP,Y(1,2)
This example uses the *VFACT command to round the values in an array vector to the number of
decimal places specified by the NUMDP scalar parameter (set to 2 in the example). The NUMDATA array
has been dimensioned and filled with the following values:
numdp=2
*vfact,10**numdp
*vfun,numdata(1),copy,numdata(1)
*vfun,numdata(1),nint,numdata(1)
*vfact,10**(-numdp)
or, you can use a slightly shorter version
numdp=2
*vfact,10**numdp
*vfact,10**(-numdp)
*vfun,numdata(1),nint,numdata(1)
The resultant NUMDATA array is then:
This example uses the *VLEN and *VMASK commands to find the set of prime numbers less than 100.
An array, MASKVECT, is created using 1.0 to indicate that the row value is a prime number and 0.0 to
indicate that the value isn't prime. The algorithm used to create the mask vector is to initialize all rows
whose value is greater than 1 to 1.0 and then loop through the range of possible factors, eliminating
all multiples of the factor. The *VLEN command sets the row increment for performing operations to
FACTOR. When the *VFILL command is processed, the row number is incremented by this value. Because
the starting row is FACTOR x 2, the rows are processed by each loop in the following manner: FACTOR
x 2, FACTOR x 3, FACTOR x 4, etc.
*dim,maskvect,,100
*vfill,maskvect(2),ramp,1
*do,factor,2,10,1
*vlen,,factor
*vfill,maskvect(factor*2),ramp,0
*enddo
*vmask,maskvect(1)
*dim,numbers,,100
*vfill,numbers(1),ramp,1,1
*status,numbers(1),1,10
The resultant output from the *STATUS command, showing the first 10 elements in NUMBERS is:
41
Array Parameters

PARAMETER STATUS- NUMBERS ( 5 PARAMETERS DEFINED)
(INCLUDING 2 INTERNAL PARAMETERS)
LOCATION VALUE
1 1 1 0.000000000E+00
2 1 1 2.00000000
3 1 1 3.00000000
4 1 1 0.000000000E+00
5 1 1 5.00000000
6 1 1 0.000000000E+00
7 1 1 7.00000000
8 1 1 0.000000000E+00
9 1 1 0.000000000E+00
10 1 1 0.000000000E+00
3.10.8.Plotting Array Parameter Vectors
You can graphically display array vector values using the *VPLOT command.
The following demonstrates some of the capabilities of the *VPLOT command. For this example, two
TABLE arrays (TABLEVAL and TABLE) and one numeric array have been dimensioned and filled with the
following values:
The following are example *VPLOT commands and their resulting plots. Note that since ARRAY data is
unordered it is plotted as a histogram; TABLE data is ordered and is therefore plotted as a curve.
Figure 3.11 Sample Plot Using*VPLOT,,arrayval(1,1),2

Figure 3.12 Sample Plot Using*VPLOT,,tableval(1,1),2
Figure 3.13 Sample Plot Using*VPLOT,table2(1),tableval(1,1),2
Figure 3.14 Sample Plot Using*VPLOT,tableval(1,0),tableval(1,1),2
3.10.9.Modifying Curve Labels
When you use *VPLOT to create your curves, default labels are assigned. Normally, the label for curve
1 is “COL 1”, the label for curve 2 is “COL 2” and so on; the column number is the field containing the
43
Array Parameters

dependent variables for that particular curve. You can use the /GCOLUMN command to apply your
own labels to the curves (any string of up to eight characters).
The example below uses the /GCOLUMN command at the beginning of the program input to apply
the labels “string01” and “string02” to the array curve.
/gcol,1,string01
/gcol,2,string02
*dim,xxx,array,10
*dim,yyy,array,10,2
xxx( 1,1) =1e6
xxx( 2,1) = 1e6 + 1e5
xxx( 3,1) = 1e6 + 2e5
xxx( 4,1) = 1e6 + 3e5
xxx( 5,1) = 1e6 + 4e5
xxx( 6,1) = 1e6 + 5e5
xxx( 7,1) = 1e6 + 6e5
xxx( 8,1) = 1e6 + 7e5
xxx( 9,1) = 1e6 + 8e5
xxx(10,1) = 1e6 + 9e5
yyy( 1,1) = 1
yyy( 2,1) = 4
yyy( 3,1) = 9
yyy( 4,1) = 16
yyy( 5,1) = 25
yyy( 6,1) = 36
yyy( 7,1) = 49
yyy( 8,1) = 64
yyy( 9,1) = 81
yyy(10,1) = 100
yyy( 1,2) = 1
yyy( 2,2) = 2
yyy( 3,2) = 3
yyy( 4,2) = 4
yyy( 5,2) = 5
yyy( 6,2) = 6
yyy( 7,2) = 7
yyy( 8,2) = 8
yyy( 9,2) = 9
yyy(10,2) = 10
*vplo,xxx(1,1), yyy(1,1) ,2

Figure 3.15 Sample Plot With User-specified Labels
The labels can be returned to the default value (COL 1 and COL 2) by issuing the /GCOLUMN command
with no string specified.
/gcol,1
/gcol,2
45
Array Parameters

Chapter 4: APDL Math
APDL Math extends the APDL scripting environment of Mechanical APDL to give you access to the
powerful matrix manipulation routines in the Mechanical APDL product, including its fast and efficient
solvers. APDL Math provides access to matrices and vectors on the .FULL, .EMAT, .MODE and .SUB
files, as well as other sources, so that you can read them in, manipulate them, and write them back out
or solve them directly. This functionality augments the vector and matrix operations (such as *VOPER
and *MOPER), in the standard APDL scripting environment. Both dense matrices and sparse matrices
can be manipulated using APDL Math.
Differences Between Standard APDL and APDL Math APDL Math works in its own workspace inde-
pendent of the APDL environment. However, APDL arrays (vectors or matrices) may be imported into
this workspace for manipulation, and also may be exported from this workspace into the standard APDL
environment.
The following is a summary of the APDL Math commands:
Commands to create and delete matrices and vectors
Creates a dense matrix.*DMAT
Creates a sparse matrix.*SMAT
Creates a vector.*VEC
Deletes a matrix or a solver object and frees its memory allocation.*FREE
Commands to manipulate matrices
Performs the matrix operation M2= v*M1 + w*M2.*AXPY
Computes the dot (or inner) product of two vectors.*DOT
Computes the fast Fourier transformation of the specified matrix or vector.*FFT
Initializes a vector or dense matrix.*INIT
Performs the matrix multiplication M3 = M1(T1)*M2(T2).*MULT
Computes the norm of the specified vector or matrix.*NRM
Compresses the columns of a matrix using a specified algorithm.*COMP
Commands to perform solutions
Creates a linear solver engine.*LSENGINE
Performs the numerical factorization of a linear solver system.*LSFACTOR
Performs the solve (forward/backward substitution) of a factorized linear
system.
*LSBAC
Performs a solution using an iterative solver.*ITENGINE
Performs a modal solution with unsymmetric or damping matrices.*EIGEN
Commands to output matrices
Exports a matrix to a file in the specified format.*EXPORT
Prints the matrix values to a file.*PRINT
47

The following topics are discussed in the remainder of this chapter:
4.1.Procedure for using APDL Math
4.2.Matrix and Vector Sizes
4.3.Accessing Complex Scalar Values
4.4.Degree of Freedom Ordering
4.5.Creating a User Superelement
4.6.Restrictions and Recommendations for Matrix Operations
4.7.APDL Math Examples
4.1.Procedure for using APDL Math
Typically, four steps are followed when using APDL Math.
1. Create the matrices.
Matrices and vectors can be created by one of the following methods:
• Directly generating matrices and vectors in APDL (*DIM, *SET, etc.).
• Having Mechanical APDL generate the matrices and vectors for you. These may come from a
prior solution or may have been generated using the WRFULL command. The matrices are
obtained from the .FULL, .EMAT, .SUB, .MODE or .RST files.
• Using external sources provided in Harwell-Boeing or Matrix Market format.
2. Read the matrices into APDL Math.
Once the files are available, you may import them into APDL Math using *DMAT for dense matrices,
*SMAT for sparse matrices, and *VEC for vectors.
3. Manipulate the matrices.
You can use the linear matrix operators *MULT and *AXPY to combine specified matrices and,
thus, create other matrices. You may also modify the contents of matrices directly by using APDL
expressions; for example, "A(3,2)=6.4".
Additionally, you can use these steps to modify the matrices using standard APDL operations:
a. Export the matrix via *EXPORT,,APDL.
b. Modify the matrix using standard APDL operations such as *SET, *MOPER, *VFUN, *DO, etc.
c. Re-import the matrix back into APDL Math via *DMAT,,,IMPORT,APDL (or *VEC,,,IMPROT,APDL
for a vector).
4. Use the matrices.
The modified matrices may be used in standard Mechanical APDL solutions, solved in APDL Math,
or exported for use in an external application, as follows.
• Use in standard Mechanical APDL solutions:
– The simplest approach is to export the matrix as a superelement (*EXPORT,,SUB) for use
in any analysis.
• Solve in APDL Math:
– Identify the solver to be used with *LSENGINE.
– Factor the matrix with *LSFACTOR.
– Solve for the unknowns with LSSOLVE.
Chapter 4:APDL Math

– Once you do these steps, you can use *ITENGINE to use a PCG algorithm to find new
solutions to a perturbed matrix (for instance, for parametric or sensitivity studies).
• Export for use in an external application using *EXPORT with the Harwell-Boeing or Matrix
Market formats.
4.2.Matrix and Vector Sizes
APDL Math automatically maintains APDL parameters corresponding to the size of every matrix and
vector you create. The APDL parameter are created as follows:
• For an example matrix named “MyMatrix”, the APDL parameters MyMatrix_rowDim and MyMat-
rix_colDim are automatically created.
• For matrices imported from the .FULL file, the APDL parameter MyMatrix_NUMDOF is automatically
created, where NUMDOF is the number of degrees of freedom per node.
• For an example vector named “MyVector”, the APDL parameter MyVector_Dim is automatically
created.
These APDL parameters are updated each time you manipulate these objects using APDL Math com-
mands.
4.3.Accessing Complex Scalar Values
The technique described here allows you to access the values of complex vectors (*VEC) or dense
matrices (*DMAT) and to manipulate either the real part or the imaginary part.
A complex dense matrix is a 2-D array of complex scalars. It can also be considered a 3-D array of real
values as shown in the figure below:
Figure 4.1 3-D Representation of a Complex Dense Matrix
a 31
a 12 a 13
a 33
a 23
a 11
a 32
a 21 a 22
Re
Re
Re
Im
Im
Im
ReRe
I mI mI m
Re
a 31
a 12 a 13
a 33
a 23
a 11
a 32
a 21 a 22A = A =<=>
The examples outlined below show several ways to access the complex scalar values.
• To get the real part of a dense matrix term, you can use the syntax:
VAL_RE = A(i,j,1)
VAL_IM = A(i,j,2)
49
Accessing Complex Scalar Values

• You can also set a new value directly, using the same logic:
A(i,j,1) = 3.5
A(i,j,2) = 0.0
• Similarly, you can access the values of a complex vector:
VAL_RE = V(i,1)
VAL_IM = V(i,2)
4.4.Degree of Freedom Ordering
Degrees of freedom (DOFs) are numbered 1-n, where n is the total number of DOFs in the system.
Mechanical APDL maintains three orderings of the DOF set:
1. The user ordering is based on the user's node numbers. As an example, this ordering corresponds
to what would be printed in the POST1 postprocessor by the PRNSOL,U command.
2. The internal ordering is obtained by compressing the unused node numbers from the user's set
and renumbering them based on the reordered element set. This reordering is performed to obtain
better cache performance as these items are referenced in the solution phase. The map between
the user ordering and this internal ordering is referred to as the "nodal equivalence table" in the
descriptions of ANSYS binary data files (see "Format of Binary Data Files" in the Programmer's
Manual).
3. The solver ordering is obtained by reordering the equations (DOFs) in order to minimize the
solver time and disk requirements. Also, the effects of any constraints (D command), couplings
(CP command), and constraint equations (CE command or MPC contact) are accounted for, thereby
reducing the DOF set. This ordering, also referred to as the BCS ordering, represents the "inde-
pendent" DOFs of the system.
The matrices and load vector imported from the .FULL file (*SMAT,,,FULL) are in terms of the BCS or-
dering; mapping from the internal ordering to this ordering is required when working with these
matrices.
The resulting solution from *LSBAC will also be in this BCS ordering.
The mode shapes from the .MODE file and the DOF results from the .RST file are in the internal ordering,
and they need to be converted before use with any of the matrices from the .FULL file, as shown below:
*SMAT,Nod2Bcs,D,IMPORT,FULL,file.full,NOD2BCS ! import the mapping vector
*DMAT,PhiI,D,IMPORT,MODE,file.mode ! import the mode shapes
*MULT,Nod2Bcs,,PhiI,,PhiB ! convert to the BCS set
To convert from BCS to internal ordering (for example, after an *LSBAC solution), use the transpose of
the NOD2BCS mapping vector:
*MULT,Nod2Bcs,TRAN,Xbcs,,Xint
To convert from external (user) ordering to the internal ordering, use the FORWARD nodal mapping
vector. The following example retrieves the UZ displacement of user node 45232 from the internal
solution vector Xint:
*VEC,MapForward,I,IMPORT,FULL,file.full,FORWARD
j = MapForward(45232)
UzVal = Xint((j-1)*NUMDOF + 3) ! 3 is the UZ DOF number
To convert from internal ordering to external (user), use the BACK nodal mapping vector. The following
example puts a force at node 672 in the FX direction into Fint:
Chapter 4:APDL Math

*VEC,MapBack,I,IMPORT,FULL,file.full,BACK
j = MapBack(672)
Fint((j-1)*NUMDOF + 1) = -1000
To convert this to solver (BCS) ordering for solving (*LSBAC):
*MULT,Nod2Bcs,,Fint,,Fbcs
4.5.Creating a User Superelement
One way to add user-defined behavior to a model is via superelements. ADPL Math allows you to import,
modify, and create superelement matrices that you can then export to a superelement .SUB file for
use in subsequent analyses.
Importing from existing .SUB files or from NASTRAN DMIG files is straightforward. These matrices can
be modified using existing APDL or APDL Math operations and the modified matrix exported to a new
.SUB file. Note that for a DMIG file export, you must supply the nodal coordinates.
Creating a .SUB file from scratch requires additional information. You must create (*DIM) an m x 2 array,
where "m" is the number of master DOFs (rows in the matrix). In the first column, put the node number
of the master DOF, and in the second column put the DOF number. This array is then passed to the
*EXPORT,,SUB command. For example:
/prep7
! Provide coordinates for SUB file
N,11
N,12,1
! Allocate the matrix and define the values
*DMAT,myk,d,alloc,4,4
myk(1,1)=1.0
myk(2,2)=1.0
myk(3,3)=1.0
myk(4,4)=1.0
myk(1,3)=-0.5
myk(3,1)=-0.5
! Allocate the row information array and define its values
*DMAT,rowinfo,i,alloc,4,2
rowinfo(1,1)=11,12,11,12 ! nodes
rowinfo(1,2)=1,2,1,2 ! dofs
*PRINT,myk
*PRINT,rowinfo
! Export to a SUB file
*EXPORT,myk,sub,mysub.sub,stiff,rowinfo,done
! List its contents
SELIST,mysub,3
4.6.Restrictions and Recommendations for Matrix Operations
The following restrictions and recommendations apply when using APDL Math matrix operations:
• You cannot directly modify a sparse matrix in APDL Math. You must export it from APDL Math to
modify it:
– Export the matrix in an ASCII format (for example, *EXPORT,,MMF).
– Edit the file.
– Import the matrix back in (*SMAT,,,IMPORT,MMF).
51
Restrictions and Recommendations for Matrix Operations

• When working with matrices and vectors, care must be taken to insure that any operations are
done using consistent ordering (see Degree of Freedom Ordering (p. 50)).
4.7.APDL Math Examples
The following examples demonstrate various applications for APDL Math.
Example 4.1 Verify Orthogonality of Eigenmodes after a Modal Analysis
! PERFORM A STANDARD MODAL ANALYSIS
/SOLU
MODOPT,lanb,10
SOLVE
FINISH
! READ M AND Nod2Bcs MATRICES FROM THE FULL FILE
*SMAT,MassMatrix,D,IMPORT,FULL,file.full,MASS
*SMAT,NodToBcs,D,IMPORT,FULL,file.full,NOD2BCS
! READ THE MODE SHAPES FROM THE MODE FILE
*DMAT,Phi,D,IMPORT,MODE,file.mode
! CONVERT THEM TO THE BCS ORDERING
*MULT,NodToBcs,,Phi,,BCSPhi
! CREATE PhiTMPhi = (Phi)T*M*Phi
*MULT,MassMatrix,,BCSPhi,,APhi
*MULT,BCSPhi,TRANS,APhi,,PhiTMPhi
! PRINT THIS MATRIX: IT SHOULD BE THE IDENTITY MATRIX [I]
*PRINT,PhiTMPhi,PhiTMPhi.txt
Example 4.2 Read a Matrix and a Load Vector from a FULL File and Solve
! READ THE STIFFNESS MATRIX FROM THE FULL FILE
*SMAT,MatK,D,IMPORT,FULL,file.full,STIFF
! READ THE MAPPING TABLE: INTERNAL -> BCS
*SMAT,Nod2Bcs,D,IMPORT,FULL,file.full,NOD2BCS
! READ THE LOAD VECTOR FROM THE FULL FILE
*DMAT,VecB,D,IMPORT,FULL,file.full,RHS
! ALLOCATE THE SOLUTION VECTOR IN BCS SPACE BY SIMPLY COPYING B
*DMAT,VecX,D,COPY,VecB
! FACTORIZE A USING THE BOEING SPARSE SOLVER FUNCTIONS
*LSENGINE,BCS,MyBcsSolver,MatK
*LSFACTOR,MyBcsSolver
! SOLVE THE LINEAR SYSTEM
*LSBAC,MyBcsSolver,VecB,VecX
! CONVERT THE SOLUTION TO THE INTERNAL SPACE
*MULT,Nod2Bcs,T,VecX,,XNod
! PRINT THE SOLUTION
*PRINT,XNod
! FREE ALL OBJECTS
*FREE,ALL
Chapter 4:APDL Math

Example 4.3 Perform a Full Harmonic Sweep
! READ THE 3 MATRICES FROM THE FULL FILE
*SMAT,MatM,D,IMPORT,FULL,file.full,MASS
*SMAT,MatC,D,IMPORT,FULL,file.full,DAMP
! READ THE MAPPING TABLE: FULL -> BCS
*SMAT,Nod2Bcs,D,IMPORT,FULL,file.full,NOD2BCS
! READ THE LOAD VECTOR FROM THE FULL FILE
*DMAT,VecB,Z,IMPORT,FULL,file.full,RHS
! ALLOCATE THE SOLUTION VECTOR IN BCS SPACE BY SIMPLY COPYING B
*DMAT,XBcs,Z,COPY,VecB
C=3.E8 ! LIGHT CELERITY
*DO,FREQ,1.E9,10.E9,1.E9 ! LOOP OVER FREQUENCY VALUES
/com,** FREQUENCY = %FREQ%
w=2*3.14*FREQ/C ! COMPUTE OMEGA (w)
w2=w*w ! w*w
! FORM THE COMPLEX SYSTEM A = K - w2*M + jw*C
*SMAT,MatA,Z,COPY,MatK
*AXPY,-w2,0.,MatM,1.,0.,MatA
*AXPY,0.,w,MatC,1.,0.,MatA
! FACTORIZE MATRIX A USING BOEING
*LSENGINE,BCS,MyBcsSolver,MatA
*LSFACTOR,MyBcsSolver
! SOLVE THE LINEAR SYSTEM
*LSBAC,MyBcsSolver,VecB,XBcs
*ENDDO
*FREE,ALL
Example 4.4 Perform an UNSYM Modal Solve from a FULL File
! DEFINE THE ANALYSIS OPTIONS
/SOLU
ANTYPE,MODAL
MODOPT,UNSYM,10,-3
! LOAD K AND M MATRICES FROM AN EXISTING FULL FILE
*SMAT,MatM,D,IMPORT,FULL,file.full,MASS
! LAUNCH THE UNSYM ALGORITHM, APPLIED TO THE GIVEN MATRICES
*EIGEN,MatK,MatM,EiV,EiM
*PRINT,EiV
FINISH
Example 4.5 Perform a DAMP Modal Solve from HBMAT Files
! DEFINE THE ANALYSIS OPTIONS
/SOLUTION
ANTYPE,MODAL
MODOPT,DAMP,10
! LOAD K, M and C MATRICES FROM EXISTING HBMAT ASCII FILES
*SMAT,MatK,D,IMPORT,HBMAT,K.hbmat,ASCII
*SMAT,MatM,D,IMPORT,HBMAT,M.hbmat,ASCII
*SMAT,MatC,D,IMPORT,HBMAT,C.hbmat,ASCII
! LAUNCH THE DAMP ALGORITHM, APPLIED TO THE GIVEN MATRICES
*EIGEN,MatK,MatM,MatC,EiV,EiM
53
APDL Math Examples

*PRINT,EiV
FINISH
Example 4.6 Import a Matrix from a .SUB File, Modify the Values, and Update the File
! LOAD THE K MATRIX FROM A SUB FILE
*DMAT,MatK,D,IMPORT,SUB,file.sub,STIFF
*PRINT,MatK
! EXPORT THE MATRIX AS A STANDARD APDL ARRAY
*EXPORT,MatK,APDL,MATKAPDL
! MODIFY THE MATRIX
MATKAPDL(1,1) = 5.0
! IMPORT THE MODIFIED MATRIX INTO APDL MATH SPACE
*DMAT,MatK,,IMPORT,APDL,MATKAPDL
! EXPORT THE MODIFIED MATRIX TO THE SUB FILE
*EXPORT,MatK,SUB,file.sub.STIFF
Chapter 4:APDL Math

Chapter 5: APDL as a Macro Language
You can record a frequently used sequence of ANSYS commands in a macro file (these are sometimes
called command files). Creating a macro enables you to, in effect, create your own custom ANSYS
command. For example, calculating power loss due to eddy currents in a magnetic analysis would require
a series of ANSYS commands in the postprocessor. By recording this set of commands in a macro, you
have a new, single command that executes all of the commands required for that calculation. In addition
to executing a series of ANSYS commands, a macro can call GUI functions or pass values into arguments.
You can also nest macros. That is, one macro can call a second macro, the second macro can call a third
macro, and so on. You can use up to 20 nesting levels, including any file switches caused by the ANSYS
/INPUT command. After each nested macro executes, the ANSYS program returns control to the previous
macro level.
The following is a very simple example macro file. In this example, the macro creates a block with di-
mensions 4, 3, and, 2 and a sphere with a radius of 1. It then subtracts the sphere from one corner of
the block.
/prep7
/view,,-1,-2,-3
block,,4,,3,,2
sphere,1
vsbv,1,2
finish
If this macro were called mymacro.mac, you could execute this sequence of commands with the fol-
lowing single ANSYS command
*use,mymacro
or (because the extension is .mac)
mymacro
Although this is not a realistic macro, it does illustrate the principle.
This chapter provides information on the various ways you can create, store, and execute macros. It
also discusses the basic information you need to use APDL as a scripting language in creating macros.
APDL commands used to define and execute macros are listed in Chapter 2 of the Command Reference.
The following specific macro topics are available:
5.1.Creating a Macro
5.2.Executing Macros and Macro Libraries
5.3.Local Variables
5.4.Controlling Program Flow in APDL
5.5.Control Functions Quick Reference
5.6.Using the _STATUS and _RETURN Parameters in Macros
5.7.Using Macros with Components and Assemblies
5.8.Reviewing Example Macros
55

5.1.Creating a Macro
You can create macros either within ANSYS itself or using your text editor of choice (such as emacs, vi,
or wordpad). If your macro is fairly simple and short, creating it in ANSYS can be very convenient. If
you are creating a longer, more complex macro or editing an existing macro then you will need a text
editor. Also, using a text editor allows you to use a similar macro or ANSYS log file as the source for
your macro.
For any long, complex macro you should always consider either using a similar macro as a starting point
or running the task interactively in ANSYS and using the resulting log file as the basis of your macro.
Either method can greatly reduce the time and effort required to create a suitable macro.
The following creating macro topics are available:
5.1.1.Macro File Naming Conventions
5.1.2.Macro Search Path
5.1.3.Creating a Macro Within ANSYS
5.1.4.Creating Macros with a Text Editor
5.1.5.Using Macro Library Files
5.1.1.Macro File Naming Conventions
Macros are a sequence of ANSYS commands stored in a file. Macros should not have the same name
as an existing ANSYS command, or start with the first four characters of an ANSYS command, because
ANSYS will execute the internal command instead of the macro. The following naming restrictions apply
to macro files:
• The file name cannot exceed 32 characters.
• The file name cannot begin with a numeral.
• The file extension cannot contain more than eight characters (if you are executing the macro as if
it were an ANSYS command it should have the extension .mac.)
• The file name or extension cannot contain spaces.
• The file name or extension cannot contain any characters prohibited by your file system and for
portability should not contain any characters prohibited by either UNIX or Windows file systems.
To ensure that you are not using the name of an ANSYS command, before creating a macro try running
the file name that you wish to use as an ANSYS command. If ANSYS returns the message shown below,
you will know that the command is not used in the current processor. You should check the macro file
name in each processor in which you plan to use the macro. (You could also check if the macro file
name matches any command listed in the online documentation; however, this method cannot locate
the names of undocumented commands.)
Figure 5.1 ANSYS Message Box for Unknown Command
Using the .mac extension allows ANSYS to execute the macro as it would any internal command. You
should avoid using the extension .MAC because it is used for ANSYS internal macros.
Chapter 5:APDL as a Macro Language

5.1.2.Macro Search Path
By default, ANSYS searches for a user macro file (.mac extension) in the following locations:
1. The /ansys_inc/v140/ansys/apdl directory.
2. The directory (or directories) designated by the ANSYS_MACROLIB environment variable (if
defined) or the login (home) directory. This environment variable is documented in The ANSYS
Environment chapter of the Operations Guide.
3. The directory designated by the $HOME environment variable.
4. The working directory.
You can place macros for your personal use in your home directory. Macros that should be available
across your site should be placed in the /ansys_inc/v140/ansys/apdl directory or some commonly
accessible directory that everyone can reference through the ANSYS_MACROLIB environment variable.
For Windows users: The "current directory" is the default directory (usually a network resource) set by
administrators and you should ask your network administrator for its location. You can use environment
variables to create a local "home directory." The local home directory is checked after the default directory
designated in your domain profile.
5.1.3.Creating a Macro Within ANSYS
You can create a macro by four methods from within ANSYS:
• Issue the *CREATE command in the input window. Parameter values are not resolved and parameter
names are written to the file.
• Use the *CFOPEN, *CFWRITE, and *CFCLOS commands. Parameter names are resolved to their
current values and those values are written to the macro file.
• Issue the /TEE command in the input window. This command writes a list of commands to a file
at the same time that the commands are being executed. As the commands are executed in the
current ANSYS session, parameter names are resolved to their current values. However, in the file
that is created, parameter values are not resolved and parameter names are written instead.
• Choose the Utility Menu> Macro> Create Macro menu item. This method opens a dialog box
that can be used as a simple, multiline editor for creating macros. Parameter values are not resolved
and parameter names are written to the file.
The following sections detail each of these methods.
5.1.3.1.Using *CREATE
Issuing *CREATE redirects ANSYS commands entered in the command input window to the file desig-
nated by the command. All commands are redirected until you issue the *END command. If an existing
file has the same name as the macro file name you specify, the ANSYS program overwrites the existing
file.
For example, suppose that you want to create a macro called matprop.mac, which automatically
defines a set of material properties. The set of commands entered into the input window for this macro
might look like this:
*CREATE,matprop,mac,macros
MP,EX,1,2.07E11
MP,NUXY,1,.27
57
Creating a Macro

MP,DENS,1,7835
MP,KXX,1,42
*END
The *CREATE command takes arguments of the file name, the file extension, and the directory path
(in this case, the macros directory is specified).
When using *CREATE, all parameters used in commands are written to the file (the currently assigned
values for the parameter are not substituted).
You cannot use *CREATE within a DO loop.
5.1.3.2.Using *CFWRITE
If you wish to create a macro file in which current values are substituted for parameters you can use
*CFWRITE. Unlike *CREATE, the *CFWRITE command cannot specify a macro name; you must first
specify the macro file with the *CFOPEN command. Only those ANSYS commands that are explicitly
prefaced with a *CFWRITE command are then written to the designated file; all other commands entered
in the command input window are executed. As with the *CREATE command, *CFOPEN can specify a
file name, a file extension, and a path. The following example writes a BLOCK command to the currently
open macro file.
*cfwrite,block,,a,,b,,c
Note that parameters were used for arguments to the BLOCK command. The current value of those
parameters (and not the parameter names) are written to the file. So, for this example, the line written
to the macro file might be
*cfwrite,block,,4,,2.5,,2
To close the macro file, issue the *CFCLOS command.
Note
While it is possible to create a macro through this method, these commands are most useful
as a method for writing ANSYS commands to a file during macro execution.
5.1.3.3.Using /TEE
Issuing /TEE,NEW or /TEE,APPEND redirects ANSYS commands entered in the command input window
to the file designated by the command at the same time that the commands are being executed. All
commands are executed and redirected until you issue the /TEE,END command. If an existing file has
the same name as the macro file name you specify with /TEE,NEW, the ANSYS program overwrites the
existing file. To avoid this, use /TEE,APPEND instead.
In addition to the Label argument (which can have a value of NEW, APPEND, or END), the /TEE com-
mand takes arguments of the file name, the file extension, and the directory path.
As the commands are executed in the current ANSYS session, all parameter names are resolved to their
current values. However, in the file that is created, parameter names are written (the currently assigned
values for the parameter are not substituted). If your current parameter values are important, you can
save the parameters to a file using the PARSAV command.
For an example, see the description of the /TEE command in the Command Reference.

5.1.3.4.Using Utility Menu> Macro> Create Macro
Choosing this menu item opens an ANSYS dialog box that you can use as a simple editor for creating
macros. You cannot open and edit an existing macro with this facility; if you use the name of an existing
macro as the arguments for the *CREATE field, the existing file will be overwritten.
Figure 5.2 The Create Menu Dialog Box
As with the *CREATE command, parameters are not evaluated but are written verbatim into the macro
file. Note that you do not make the last line a *END command.
5.1.4.Creating Macros with a Text Editor
You can use your favorite text editor to create or edit macro files. Any ASCII editor will work. Moreover,
ANSYS macros can have their lines terminated by either UNIX or Windows line ending conventions
(carriage-return, line-feed pairs or simply line-feeds) so you can create a macro on one platform and
use it on several platforms.
If you use this method to create macros, do not include the *CREATE and *END commands.
59
Creating a Macro

Figure 5.3 A Macro Created in a Text Editor
5.1.5.Using Macro Library Files
As a convenience, ANSYS allows you to place a set of macros in a single file, called a macro library file.
You can create these either through the *CREATE command or through a text editor. Given that macro
libraries tend to be longer than single macros, using a text editor normally provides the best approach.
Macros libraries have no explicit file extension and follow the same file naming conventions as macro
files. A macro library file has the following structure:
MACRONAME1
.
.
.
/EOF
MACRONAME2
.
.
.
/EOF
MACRONAME3
.
.
.
./EOF
For example, the following macro file contains two simple macros:
mybloc
/prep7
/view,,-1,-2,-3
block,,4,,3,,2
finish
/EOF
mysphere
/prep7
/view,,-1,-2,-3
sphere,1
finish
/EOF
Note that each macro is prefaced with a macro name (sometimes referred to as a data block name) and
ends with a /EOF command.

A macro library file can reside anywhere on your system, although for convenience you should place
it within the macro search path. Unlike macro files, a macro library file can have any extension up to
eight characters.
5.2.Executing Macros and Macro Libraries
You can execute any macro file by issuing the *USE command. For example, to execute the macro
called MYMACRO (no extension) residing in the current working directory, you would issue
*use,mymacro
In this case, the macro takes no arguments. If instead the macro was called MYMACRO.MACRO and
resided in /myaccount/macros, you could call it with
*use,/myaccount/macros/mymacro.macro
Note that the *USE command allows you to enter the path and extension along with the file name and
that these are not entered as separate arguments.
If a macro has a .mac file extension and resides in the search path, you can execute it as if it were an
ANSYS command by simply entering it in the command input window. For example, to call
mymacro.mac you could simply enter
mymacro
You can also execute macros with a .mac extension through the Utility Menu> Macro> Execute Macro
menu item.
If the same macro takes arguments (see Passing Arguments to a Macro (p. 62) for more information
about passing arguments to macros), then these can be entered on the command line as follows
mymacro,4,3,2,1.5
or
*use,mymacro.mac,4,3,2,1.5
The Utility Menu> Macro> Execute Macro menu item dialog provides fields for arguments.
Executing macros contained in macro libraries is similar. You must first specify the library file using the
*ULIB command. For example, to specify that macros are in the mymacros.mlib file, which resides
in the /myaccount/macros directory, you would issue the following command:
*ulib,mymacros,mlib,/myaccount/macros/
After selecting a macro library, you can execute any macro contained in the library by specifying it
through the *USE command. As with macros contained in individual files, you can specify arguments
as parameters in the *USE command.
Note
You cannot use the *USE command to access macros not contained in the specified macro
library file after issuing the *ULIB command.
61
Executing Macros and Macro Libraries

5.3.Local Variables
APDL provides two sets of specially named scalar parameters which are available for use as local variables.
These consist of
• A set of scalar parameters that provide a way of passing command line arguments to the macro.
• A set of scalar parameters that can be used within the macro. These provide a set of local variables
that can be used to define values only within that macro.
The following sections discuss both of these variable types in detail.
5.3.1.Passing Arguments to a Macro
There are 19 scalar parameters that you can use to pass arguments from the macro execution command
line to the macro. These scalar parameters can be reused with multiple macros; that is, their values are
local to each macro. The parameters are named ARG1 through AR19 and they can be used for any of
the following items:
• Numbers
• Alphanumeric character strings (up to 32 characters enclosed in single quotes)
• Numeric or character parameters
• Parametric expressions
Note
You can pass only the values of parameters ARG1 through AR18 to a macro as arguments
with the *USE command. If you create a macro that can be used as an ANSYS command
(the macro files has a .mac extension), you can pass the values of parameters ARG1 through
AR19 to the macro.
For example, the following simple macro requires four arguments, ARG1, ARG2, ARG3, and ARG4:
/prep7
/view,,-1,-2,-3
block,,arg1,,arg2,,arg3
sphere,arg4
vsbv,1,2
finish
To execute this macro, a user might enter
mymacro,4,3,2.2,1
5.3.2.Local Variables Within Macros
Each macro can have up to 80 scalar parameters used as local variables (AR20 through AR99). These
parameters are completely local to the macro, and multiple macros can each have their own unique
values assigned to these parameters. These parameters are not passed to macros called from macros
(nested macros). They are passed to any files processed through a /INPUT command or a "do loop"
processed within the macro.

5.3.3.Local Variables Outside of Macros
ANSYS also has a similar set of ARG1 through AR99 scalar parameters that are local to an input file, and
are not passed to any macros called by that input file. Thus, once a macro finishes and execution returns
to an input file, the values of ARG1 through AR99 revert to whatever values were defined within the
input file.
5.4.Controlling Program Flow in APDL
When executing an input file, ANSYS is normally restricted to linear program flow; that is, each statement
is executed in the order that it is encountered in the listing. However, APDL provides a rich set of
commands that you can use to control program flow. These commands are listed in Chapter 2 of the
Command Reference.
• Call subroutines (nested macros).
• Branch unconditionally to a specified location with a macro.
• Branch based upon a condition to a specified location within a macro.
• Repeat the execution of a single command, incrementing one or more command parameters.
• Loop through a section of a macro a specified number of times.
The following sections detail each of these program control capabilities. For the exact syntax of the
commands, refer to the Command Reference.
5.4.1.Nested Macros:Calling Subroutines Within a Macro
5.4.2.Unconditional Branching:Goto
5.4.3.Conditional Branching:The *IF Command
5.4.4.Repeating a Command
5.4.5.Looping:Do-Loops
5.4.6.Implied (colon) Do Loops
5.4.7.Additional Looping:Do-While
5.4.1.Nested Macros: Calling Subroutines Within a Macro
APDL allows you to nest macros up to 20 levels deep, providing functionally similar capability to a
FORTRAN CALL statement or to a function call. You can pass up to 19 arguments to the macro and, at
the conclusion of each nested macro, execution returns to the level that called the macro. For example,
the following simply macro library file shows the MYSTART macro, which calls the MYSPHERE macro
to create the sphere.
mystart
/prep7
/view,,-1,-2,-3
mysphere,1.2
finish
/eof
mysphere
sphere,arg1
/eof
5.4.2.Unconditional Branching: Goto
The simplest branching command, *GO, instructs the program to go to a specified label without executing
any commands in between. Program flow continues from the specified label. For example
*GO,:BRANCH1
--- ! This block of commands is skipped (not executed)
63
Controlling Program Flow in APDL

---
:BRANCH1
---
---
The label specified by the *GO command must start with a colon (:) and must not contain more than
eight characters, including the colon. The label can reside anywhere within the same file.
Note
The use of *GO is now considered obsolete and is discouraged. See the other branching
commands for better methods of controlling program flow.
5.4.3.Conditional Branching:The *IF Command
APDL allows you to execute one of a set of alternative blocks based on the evaluation of a condition.
The conditions are evaluated by comparing two numerical values (or parameters that evaluate to nu-
merical values).
The *IF command has the following syntax
*IF, VAL1, Oper, VAL2, Base
Where
• VAL1 is the first numerical value (or numerical parameter) in the comparison.
• Oper is the comparison operator.
• VAL2 is the second numerical value (or numerical parameter) in the comparison.
• Base is the action that occurs if the comparison evaluates as true.
APDL offers eight comparison operators, which are discussed in detail in the *IF command reference.
Briefly these are:
EQ
Equal (for VAL1 = VAL2).
NE
Not equal (for VAL1 ≠ VAL2).
LT
Less than (for VAL1 < VAL2).
GT
Greater than (for VAL1 > VAL2).
LE
Less than or equal (for VAL1 ≤ VAL2).
GE
Greater than or equal (for VAL1 ≥ VAL2).
ABLT
Absolute values of VAL1 and VAL2 before < operation.
ABGT
Absolute values of VAL1 and VAL2 before > operation.

By giving the Base argument a value of THEN, the *IF command becomes the beginning of an if-then-
else construct (similar to the FORTRAN equivalent). The construct consists of
• An *IF command, followed by
• One or more optional *ELSEIF commands
• An optional *ELSE command
• A required *ENDIF command, marking the end of the construct.
In its simplest form, the *IF command evaluates the comparison and, if true, branches to a label specified
in the Base argument. This is similar to the "computed goto" in FORTRAN. (In combination, a set of
such *IF commands could function similarly to the CASE statements in other programming languages.)
Take care not to branch to a label within an if-then-else construct or do-loop. If a batch input stream
hits an end-of-file during a false *IF condition, the ANSYS run will not terminate normally. You will need
to terminate it externally (use either the UNIX “kill” function or the Windows task manager).
By setting the Base argument to a value of STOP, you can exit from ANSYS based on a particular con-
dition.
An if-then-else construct simply evaluates a condition and executes the following block or jumps to
the next statement following the *ENDIF command (shown with the "Continue" comment).
*IF,A,EQ,1,THEN
! Block1
.
.
*ENDIF
! Continue
The following example shows a more complex structure. Note that only one block can be executed. If
no comparison evaluates to true, the block following the *ELSE command is executed.
Figure 5.4 A Sample If-Then-Else Construct
65

Note
You can issue a /CLEAR command within an if-then-else construct. The /CLEAR command
does not clear the *IF stack and the number of *IF levels is retained. An *ENDIF is necessary
to close any branching logic. Also, keep in mind that the /CLEAR command deletes all
parameters, including any that are used in your branching commands. You can avoid any
problems that might arise from the deletion of parameters by issuing a PARSAV command
before the /CLEAR command, and then following the /CLEAR command with a PARRES
command.
5.4.4.Repeating a Command
The simplest looping capability, the *REPEAT command, allows you to execute the directly preceding
command a specified number of times, incrementing any field in that command by a constant value.
In the example
E,1,2
*REPEAT,5,0,1
the E command generates one element between nodes 1 and 2 and the following *REPEAT command
specifies that E executes a total of five times (including the original E command), incrementing the
second node number by one for each additional execution. The result is five total elements with node
connectivities 1-2, 1-3, 1-4, 1-5, and 1-6.
Note
Most commands that begin with a slash (/) or an asterisk (*), as well as macros executed as
"unknown commands," cannot be repeated. However, graphics commands that begin with
a slash can be repeated. Also, avoid using the *REPEAT command with interactive commands,
such as those that require picking or those that require a user response.
5.4.5.Looping: Do-Loops
A do-loop allows you to loop through a series of commands a specified number of times. The *DO and
*ENDDO commands mark the beginning and ending points for the loop. *DO command has the following
syntax:
The following example do-loop edits five load step files (numbered 1 through 5) and makes the same
changes in each file.
*DO,I,1,5 ! For I = 1 to 5:
LSREAD,I ! Read load step file I
OUTPR,ALL,NONE ! Change output controls
ERESX,NO
LSWRITE,I ! Rewrite load step file I
*ENDDO
You can add your own loop controls by using the *IF, *EXIT, or *CYCLE commands.
Keep the following guidelines in mind when constructing do-loops.
• Do not branch out of a do-loop with a :Label on the *IF or *GO commands.
• Avoid using a :Label to branch to a different line within a do-loop. Use if-then-else-endif instead.

• Output from commands within a do-loop is automatically suppressed after the first loop. Use
/GOPR or /GO (no response line) within the do-loop if you need to see output for all loops.
• Take care if you include a /CLEAR command within a do-loop. The /CLEAR command does not
clear the do-loop stack, but it does clear all parameters including the loop parameter in the *DO
statement itself. You can avoid the problem of having an undefined looping value by issuing a
PARSAV command before the /CLEAR command, and then following the /CLEAR command with
a PARRES command.
5.4.6.Implied (colon) Do Loops
You can also use the implied (colon) convention for do loops. Using this convention is typically faster
because the looping is done in memory. The correct syntax is:
(x:y:z)
with z defaulting to 1 if not specified. For example:
n,(1:6),(2:12:2)
will perform the same steps as:
n,1,2
n,2,4
n,3,6
.
.
.
n,6,12
When using the implied (colon) do loops, be aware that the shortest expression controls execution. For
example,
n,(1:7),(2:12:2)
would behave identically to the example above.
Additional numeric fields that do not have the colon (:) will be taken as a constant value.
Also, non-integer numbers will function normally. However, if non-integer numbers are applied to a
command that requires integers, then the non-integer will be rounded off following normal mathemat-
ical conventions.
This looping convention can be used only for fields requiring a numeric entry. Looping may also be
used with GET function arguments, for example a(1:5)=nx(1:5). A text entry field will process (x:y:z) as
a literal value.
5.4.7.Additional Looping: Do-While
You can also perform looping functions that will repeat indefinitely until an external parameter changes.
The *DOWHILE command has the following syntax:
*DOWHILE,Parm
The loop repeats as long as the parameter Parm is TRUE. If Parm becomes false (less than or equal to
0.0), the loop terminates. The *CYCLE and *EXIT commands can be used within a *DOWHILE loop.
67

5.5.Control Functions Quick Reference
The table below describes APDL commands that perform control functions within macros.
Most of the important information about these commands appears here, but you may want to look at
the complete command descriptions in the Command Reference.
Usage TipsAction It TakesAPDL
Com-
mand
Defines the start of a
"do" loop.The com-
*DO • You can also control looping via the *IF command.
• ANSYS allows up to 20 levels of nested “do” loops, although
“do” loops that include /INPUT, *USE, or an “unknown”
mands following the
*DO command ex-
command macro support fewer nesting levels because
they do internal file switching.
ecute (up to the *EN-
DDO command) re-
• *DO, *ENDDO, *CYCLE, and *EXIT commands in a “do”
loop must all read from the same file or the keyboard.
peatedly until some
loop control is satis-
fied. • Do not include picking operations in a “do” loop.
• Be careful if you include a /CLEAR command within a do-
loop. The /CLEAR command does not clear the do-loop
stack, but it does clear all parameters including the loop
parameter in the *DO statement itself. You can avoid the
problem of having an undefined looping value by issuing
a PARSAV command before the /CLEAR command, and
then following the /CLEAR command with a PARRES
command.
You must use one *ENDDO command for each nested "do" loop.
The *ENDDO and *DO commands for a loop must be on the
same file.
Ends a "do" loop and
starts the looping ac-
tion.
*EN-
DDO
Youcanusethecycleoptionconditionally(viathe*IFcommand).
The *CYCLE command must appear on the same file as the *DO
command and must appear before the *ENDDO command.
Whenexecutinga"do"
loop,ANSYS bypasses
all commands
*CYCLE
between the *CYCLE
and *ENDDO com-
mands,then (if applic-
able) initiates the next
loop.
The command following the *ENDDO command executes next.
The *EXIT and *DO commands for a loop must be on the same
Exits from a "do" loop.*EXIT
file.You can use the exit option conditionally (via the *IF com-
mand).
Causes commands to
be read conditionally.
*IF • You can have up to 10 nested levels of *IF blocks.
• You cannot jump into, out of, or within a "do" loop or an
if-then-else construct to a :label line, and jumping to a :label
line is not allowed with keyboard entry.
• You can issue a /CLEAR command within an if-then-else
construct. The /CLEAR command does not clear the *IF

Usage TipsAction It TakesAPDL
Com-
mand
stack and the number of *IF levels is retained. An *ENDIF
is necessary to close any branching logic.
• The /CLEAR command deletes all parameters, including
any that are used in your branching commands. You can
avoid any problems that might arise from the deletion of
parameters by issuing a PARSAV command before the
/CLEAR command, and then following the /CLEAR com-
mand with a PARRES command.
The *IF and *ENDIF commands must appear in the same file.Terminates an if-then-
elseconstruct.(Seethe
*ENDIF
*IF discussion for de-
tails.)
The *ELSE and *IF commands must appear in the same file.Creates a final,option-
al block separator
*ELSE
within an if-then-else
construct.(See the *IF
discussion for details.)
If Oper = EQ or NE,VAL1 and VAL2 can also be character strings
(enclosed in quotes) or parameters.The *IF and *ELSEIF com-
mands must be on the same file.
Creates an optional,
intermediate block
separator within an if-
then-else construct.
*ELSEIF
5.6.Using the _STATUS and _RETURN Parameters in Macros
The ANSYS program generates two parameters, _STATUS and _RETURN, that you can also use in your
macros. For example, you might use the _STATUS or _RETURN value in an "if-then-else" construct to
have the macro take some action based on the outcome of executing an ANSYS command or function.
Solid modeling functions generate the _RETURN parameter, which contains the result of executing the
function. The following table defines the _RETURN values for the various solid modeling functions:
Table 5.1 _RETURN Values
_RETURN ValueFunctionCommand
Keypoints
keypoint numberDefines a keypointK
Keypoint numberKeypoint on a lineKL
Keypoint numberKeypoint at nodeKNODE
KP numberKeypoint between two keypointsKBETW
KP numberKeypoint at centerKCENTER
Lines
Line numberGenerate splineBSPLIN
First line numberGenerate circular arc linesCIRCLE
Line numberLine between two keypointsL
69
Using the _STATUS and _RETURN Parameters in Macros

_RETURN ValueFunctionCommand
Line numberLine at angle with two linesL2ANG
Line numberLine tangent to two linesLANG
Line numberDefines a circular arcLARC
Line numberLine between two keypointsLAREA
Line numberCombine two lines into oneLCOMB
First keypoint numberDivide line into two or more linesLDIV
First line numberLine by keypoint sweepLDRAG
Fillet line numberFillet line between two liensLFILLT
First line numberArc by keypoint rotationLROTAT
Line numberStraight lineLSTR
Line numberLine at end and tangentLTAN
First line numberSegmented splineSPLINE
Areas
Area numberArea connecting keypointsA
Area numberConcatenate two or more areasACCAT
First area numberDrag lines along pathADRAG
Fillet area numberFillet at intersection of two areasAFILLT
Area numberArea bounded by linesAL
Area numberArea offset from given areaAOFFST
First area numberRotate lines around axisAROTAT
First area numberSkin surface through guiding linesASKIN
Area numberArea using shape of existing areaASUB
Volumes
Volume numberVolume through keypointsV
Volume numberVolume bounded through areasVA
First volume numberDrag area pattern to create volumeVDRAG
First volume numberVolume by extruding areasVEXT
Volume numberVolume offset from given areaVOFFST
First volume numberVolume by rotating areasVROTAT
Executing an ANSYS command, whether in a macro or elsewhere, generates the parameter _STATUS.
This parameter reflects the error status of that command:
• 0 for no error
• 1 for a note
• 2 for a warning
• 3 for an error

5.7.Using Macros with Components and Assemblies
To make large models easier to manage, you may want to divide a model into discrete components
based on different types of entities: nodes, elements, keypoints, lines, areas, or volumes. Each component
can contain only one type of entity. Doing this enables you to perform tasks such as applying loads or
producing graphics displays conveniently and separately on different portions of the model.
You can also create assemblies, which are groups that combine two or more components or even
multiple assemblies. You can nest assemblies up to five levels deep. For example, you could build an
assembly named motor from components called STATOR, PERMMAG, ROTOR, and WINDINGS.
The table below describes some of the commands you can issue to build components and assemblies.
For more detailed discussions of these commands, see the Command Reference. For further information
on components and assemblies, see Selecting and Components in the Basic Analysis Guide.
Groups geometry items into a componentCM
Deletes a component or assembly.CMDELE
Edits an existing component or assembly.ANSYS updates assemblies auto-
matically to reflect deletions of lower-level or assemblies.
CMEDIT
Groups components and assemblies into one assembly.Once defined,an
assembly can be listed,deleted,selected,or unselected using the same
commands as for components.
CMGRP
Lists the entities contained in a component or assembly.CMLIST
Selects a subset of components and assemblies.CMSEL
5.8.Reviewing Example Macros
Following are two example macros. The example macro below, called offset.mac, offsets selected
nodes in the PREP7 preprocessor. This macro is for demonstration purposes only because the NGEN
command provides a more convenient method.
! Macro to offset selected nodes in PREP7
! The below file is saved as: offset.mac (must be lowercase)
! Usage: offset,dx,dy,dz
/nop ! suppress printout for this macro
*get,nnode,node,,num,max ! get number of nodes
*dim,x,,nnode ! set up arrays for node locations
*dim,y,,nnode
*dim,z,,nnode
*dim,sel,,nnode ! set up array for select vector
*vget,x(1),node,1,loc,x ! get coordinates
*vget,y(1),node,1,loc,y
*vget,z(1),node,1,loc,z
*vget,sel(1),node,1,nsel ! get selected set
*voper,x(1),x(1),add,arg1 ! offset locations
*voper,y(1),y(1),add,arg2
*voper,z(1),z(1),add,arg3
! *do,i,1,nnode ! store new positions
! *if,sel(i),gt,0,then ! this form takes 98 sec for 100,000 nodes
! n,i,x(i),y(i),z(i)
! *endif
71
Reviewing Example Macros

! *enddo
*vmask,sel(1) ! takes 3 seconds for 100,000 nodes
n,(1:NNODE),x(1:NNODE),y(1:NNODE),z(1:NNODE)
x(1) = ! delete parameters (cleanup)
y(1) =
z(1) =
sel(1) =
i=
nnode=
/go ! resume printout
The following example macro, called bilinear.mac, evaluates two bilinear materials. This is a useful
macro that can be run after solving a static analysis. Material 1 is the tension properties, and Material
2 is the compression properties. ARG1 is the number of iterations (default is 2).
/nop
_niter = arg1 ! set number of iterations
*if,_niter,lt,2,then
_Niter = 2
*endif
*do,iter,1,_niter ! loop on number of iterations
/post1
set,1,1
*get,ar11,elem,,num,maxd ! Get number of elements
*dim,_s1,,ar11 ! array for element s1
*dim,_s3,,ar11 ! array for element s3
etable,sigmax,s,1 ! s1 is in element table sigmax
etable,sigmin,s,3 ! s3 is in element table sigmin
*vget,_s1(1),elem,1,etab,sigmax ! get element maximum stress in s1
*vget,_s3(1),elem,1,etab,sigmin ! get element minimum stress in s3
*dim,_mask,,ar11 ! array for mask vector
*voper,_mask(1),_s1(1),lt,0 ! true if max. stress < 0
*vcum,1 ! accumulate compression elements
*vabs,0,1 ! absolute value of s3
*voper,_mask(1),_s3(1),gt,_s1(1) ! true if abs(minstr) > maxstr
finish
/prep7 ! go to prep7 for element material mods
mat,1 ! set all materials to tension properties
emod,all
*vput,_mask(1),elem,1,esel ! select compression elements
mat,2 ! change selected elements to compression
emod,all
call ! select all elements
finish
_s1(1)= ! clean up all vectors (set to zero)
_s3(1)=
_mask(1)=
/solve ! rerun the analysis
solve
finish
*enddo ! end of iterations
_niter= ! clean up iteration counters
_iter=
/gop

Chapter 6: Interfacing with the GUI
Within an ANSYS macro, you have several ways to access components of the ANSYS graphical user in-
terface (GUI):
• You can modify and update the ANSYS toolbar (this is discussed in detail in Adding Commands to
the Toolbar).
• You can issue the *ASK command to prompt a user to enter a single parameter value.
• You can create a dialog box to prompt a user to enter multiple parameter values.
• You can issue the *MSG command to have the macro write an output message.
• You can have the macro update or remove a status bar.
• You can allow the user to select entities through graphical picking from within a macro.
• You can call any dialog box.
The following GUI topics are available:
6.1.Prompting Users for a Single Parameter Value
6.2.Prompting Users With a Dialog Box
6.3.Using Macros to Display Your Own Messages
6.4.Creating and Maintaining a Status Bar from a Macro
6.5.Picking within Macros
6.6.Calling Dialog Boxes From a Macro
6.1.Prompting Users for a Single Parameter Value
By including the *ASK command within a macro, you can have the macro prompt a user to type in a
parameter value.
The format for the *ASK command is
*ASK,Par,Query,DVAL
Where
• Par is an alphanumeric name that identifies the scalar parameter used to store the user input.
• Query is the text string that ANSYS displays to prompt the user. This string can contain up to 54
characters. Don't use characters that have special meanings, such as "$" or "!".
• DVAL is the default value given the parameter if a user issues a blank response. This value can be
either a one-to-eight character string (enclosed in single quotes) or a number. If you assign no
default, a blank user response deletes the parameter.
The *ASK command prints the Query text on the screen and waits for a response. It reads the response
from the keyboard except when ANSYS runs in batch mode. (In that case, the response or responses
must be the next-read input line or lines.) The response can be a number, a one-to-eight character
string enclosed in single quotes, a numeric or character parameter, or an expression that evaluates to
73

a number. ANSYS then sets the value of Par to the read-in response. The following example displays
the dialog box shown below, then sets the parameter PARM1 to the value the user enters.
*ask,parm1,'username (enclose the username in single quotes)'
Figure 6.1 An Example *ASK Dialog Box
When you issue *ASK within a macro, ANSYS writes the user's response to File.LOG on the line fol-
lowing the macro name.
6.2.Prompting Users With a Dialog Box
The MULTIPRO command constructs a simple, multiple-prompt dialog box that can contain up to 10
parameter prompts. The command allows you to use a set of UIDL *CSET commands to create the
prompts as well as specify a default value for each prompt. Be aware that macros using MULTIPRO
cannot be called from UIDL. You cannot use MULTIPRO within a DO loop.
The MULTIPRO command must be used in conjunction with:
• Between one and ten *CSET command prompts
• Up to two special *CSET commands that provide a two line area for user instructions.
The command has the following syntax:
MULTIPRO,'start',Prompt_Num
*CSET,Strt_Loc,End_Loc,Param_Name,'Prompt_String',Def_Value
MULTIPRO,'end'
Where
'start'
A literal string that, when encountered as the first argument, marks the beginning of the MULTIPRO
construct. The literal must be enclosed in single quotes.
Prompt_Num
Required only if Def_Value is omitted from at least one *CSET command or if Def_Value is
set to 0. The Prompt_Num value is an integer equal to the number of following *CSET prompts.
Strt_Loc,End_Loc
The initial value for Strt_Loc for the first *CSET command is 1, and the value for End_Loc is
Strt_Loc+2 (3 for the first *CSET command). The value of each subsequent Strt_Loc is the
previous End_Loc+1.
Param_Name
The name of the parameter that will hold either the value specified by the user or, if the user supplies
no value, the value of Def_Value .
''Prompt_String''
A string, which can contain up to 32 characters, which can be used to describe the parameter. This
string must be enclosed in single quotes.
Chapter 6:Interfacing with the GUI

Def_Value
Default value used if no value specified by user. Default value can be a numeric expression including
APDL numeric parameters. Character expressions are not allowed.
'end'
A literal string, used as the first argument for the closing MULTIPRO command.
The following is a typical example of the MULTIPRO command.
multipro,'start',3
*cset,1,3,beamW,'Enter the overall beam width',12.5
*cset,4,6,beamH,'Enter the beam height',23.345
*cset,7,9,beamL,'Enter the beam length',50.0
multipro,'end'
Up to two optional *CSET commands can be added to the construct that can provide two 64 character
strings. You can use these to provide instructions to the user. The syntax for these specialized *CSET
commands is
*CSET,61,62,'Help_String','Help_String'*CSET,63,64,'Help_String','Help_String'
Where
'Help_String'
A string which can contain up to 32 characters. If you need more than 32 characters, you can use
a second Help_String argument.
The following is an example of a MULTIPRO construct using the optional help lines. Note that two
Help_String arguments are used to overcome the 32 character limit.
multipro,'start',3
*cset,1,3,dx,'Enter DX Value',0.0
*cset,4,6,dy,'Enter DY Value',0.0
*cset,7,9,dz,'Enter DZ Value',0.0
*cset,61,62,'The MYOFSET macro offsets the',' selected nodes along each'
*cset,63,64,'of the three axes. Fill in the ',' fields accordingly.'
multipro,'end'
The above construct creates the following multiple-prompt dialog box.
Figure 6.2 A Typical Multiple-Prompt Dialog Box
You can check the status of the buttons by testing the value of the _BUTTON parameter. The following
lists the button status values:
• _BUTTON = 0 indicates that the OK button was pressed.
75
Prompting Users With a Dialog Box

• _BUTTON = 1 indicates that the Cancel button was pressed.
At present, the Help button is not functional.
6.3.Using Macros to Display Your Own Messages
By issuing the *MSG command within a macro, you can display custom output messages via the ANSYS
message subroutine. The command has the following format:
*MSG,Lab,VAL1,VAL2,VAL3,VAL4,VAL5,VAL6,VAL7,VAL8
Where Lab is one of the following labels for output and termination control:
Writes the message with no heading (default).INFO
Writes the message with a "NOTE" heading.NOTE
Writes the message with a "WARNING" heading,and also writes it to the errors file,
Jobname.ERR.
WARN
Writes the message with an "ERROR" heading and also writes it to the errors file,Job-
name.ERR.If this is an ANSYS batch run,this label also terminates the run at the
earliest "clean exit" point.
ERROR
Writes the message with a "FATAL ERROR" heading and also writes it to the errors file,
Jobname.ERR.This label also terminates the ANSYS run immediately.
FATAL
Writes the message with a "NOTE" heading and displays it in the message dialog box.UI
VAL1 through VAL8 are numeric or alphanumeric character values to be included in the message. Values
can be the results of evaluating parameters. All numeric values are assumed to be double precision.
You must specify the message format immediately after the *MSG command. The message format can
contain up to 80 characters, consisting of text strings and predefined "data descriptors" between the
strings where numeric or alphanumeric character data are to be inserted. These data descriptors are:
• %i, for integer data. The FORTRAN nearest integer (NINT) function is used to form integers for the
%I descriptor.
• %g, for double precision data
• %c, for alphanumeric character data
• %/, for a line break
The corresponding FORTRAN data descriptors for the first three descriptors are I9, 1PG16.9, and A8 re-
spectively. A blank must precede each descriptor. You also must supply one data descriptor for each
specified value (eight maximum), in the order of the specified values.
Don't begin *MSG format lines with *IF, *ENDIF, *ELSE, or *ELSEIF. If the last non-blank character of
the message format is an ampersand (&), the ANSYS program reads a second line as a continuation of
the format. You can use up to 10 lines (including the first) to specify the format information.
Consecutive blanks are condensed into one blank upon output, and a period is appended. The output
produced can be up to 10 lines of 72 characters each (using the %/ descriptor).
The example below shows you an example of using *MSG that prints a message with two integer values
and one real value:
*MSG, INFO, 4Inner4 ,25,1.2,148
Radius ( %C) = %I, Thick = %G, Length = %I

The resulting output message is as follows:
Radius (Inner) = 25, Thick = 1.2, Length = 148
Here is an example illustrating multiline displays in GUI message windows:
*MSG,UI,Vcoilrms,THTAv,Icoilrms,THTAi,Papprnt,Pelec,PF,indctnc
Coil RMS voltage, RMS current, apparent pwr, actual pwr, pwr factor: %/&
Vcoil = %G V (electrical angle = %G DEG) %/&
Icoil = %G A (electrical angle = %G DEG) %/&
APPARENT POWER = %G W %/&
ACTUAL POWER = %G W %/&
Power factor: %G %/&
Inductance = %G %/&
VALUES ARE FOR ENTIRE COIL (NOT JUST THE MODELED SECTOR)
Note
The command /UIS,MSGPOP controls which messages a message dialog box displays when
the GUI is active. See the Command Reference for more information about this command.
6.4.Creating and Maintaining a Status Bar from a Macro
Within macros, you can insert commands to define an ANSYS dialog box containing a status bar displaying
the progress of an operation, a STOP button you can click on to stop the operation, or both.
To define a status dialog box, issue the following command:
*ABSET,Title40,Item
• Title40 is the text string that appears in the dialog box with the status bar. The string can contain a
maximum of 40 characters.
• Item is one of the following values:
Displays the status bar with no STOP buttonBAR
Displays a STOP button with no status barKILL
Displays both the status bar and STOP buttonBOTH
To update the status bar, issue the command *ABCHECK,Percent,NewTitle.
• Percent is an integer between 0 and 100. It gives the position of the status bar.
• NewTitle is a 40-character string that contains progress information. If you specify a string for
NewTitle, it replaces the string supplied in Title40.
If you specify KILL or BOTH, your macro should check the _RETURN parameter after each execution of
*ABCHECK to see if the user has pressed the STOP button, then take the appropriate action.
To remove the status bar from the ANSYS GUI, issue the *ABFINI command.
The following example macro illustrates the status bar (complete with bar and STOP button) in use.
The status dialog box that is produced is shown in the following figure. Note that the macro checks
the status of the _RETURN parameter and, if the STOP button is pressed, posts the "We are stopped......"
message.
fini
/clear,nost
77
Creating and Maintaining a Status Bar from a Macro

/prep7
n,1,1
n,1000,1000
fill
*abset,'This is a Status Bar',BOTH
myparam = 0
*do,i,1,20
j = 5*i
*abcheck,j
*if,_return,gt,0,then
myparam = 1
*endif
*if,myparam,gt,0,exit
/ang,,j
nplot,1
myparam = 1
*endif
nlist,all
myparam = 1
*endif
*enddo
*if,myparam,gt,0,then
*msg,ui
We are stopped.........
*endif
*abfinish
fini
Note
Do not call *ABCHECK more than about 20 times in a loop.
Figure 6.3 A Typical Status Dialog Box
6.5.Picking within Macros
If you're running the ANSYS program interactively, you can call a GUI picking menu from within a macro.
To do so, simply include a picking command in the macro. Many ANSYS commands (such as K,,P) accept
the input "P" to enable graphical picking. When ANSYS encounters such a command, it displays the
appropriate picking dialog and then continues macro execution when the user clicks OK or Cancel.
Keep in mind that picking commands are not available in all ANSYS processors, and that you must first
switch to an appropriate processor before calling the command.
Note
If a macro includes GUI functions, the /PMACRO command should be the first command in
that macro. This command causes the macro contents to be written to the session log file.
This is important, because if you omit the /PMACRO command, ANSYS can't read the session
log file to reproduce the ANSYS session.

6.6.Calling Dialog Boxes From a Macro
When the ANSYS program encounters a dialog box UIDL function name (such as Fnc_UIMP_Iso), it displays
the appropriate dialog box. Thus, you can launch any ANSYS dialog box by making its function name
a separate line in the macro file. When you dismiss that dialog box, the program continues processing
the macro starting with the next line after the function call.
Keep in mind that many dialog boxes have a number of dependencies, including that the appropriate
ANSYS processor is active and that certain required preexisting conditions are met. For example,
launching a dialog box to select nodes first supposes that nodes exist, if no nodes exist the macro will
fail when the user clicks OK or Apply.
Note
If a macro includes GUI functions, the /PMACRO command should be the first command in
that macro. This command causes the macro contents to be written to the session log file.
This is important, because if you omit the /PMACRO command, ANSYS can't read the session
log file to reproduce the ANSYS session.
79
Calling Dialog Boxes From a Macro

Chapter 7: Encrypting Macros
ANSYS provides the ability to encrypt macro files so that the source is not "human-readable." Encrypted
macros require an encryption key to run. You can either place the encryption key explicitly (in readable
ASCII) in the macro or you can set it in ANSYS as a global encryption key.
The following macro encryption topics are available:
7.1.Preparing a Macro for Encryption
7.2.Creating an Encrypted Macro
7.3.Running an Encrypted Macro
7.1.Preparing a Macro for Encryption
Before encrypting a macro, you first create and debug the macro as usual. When you create an encrypted
macro, you are responsible for keeping the original source file. You cannot recreate the source file from an
encrypted macro. You then add an /ENCRYPT command as the first line and last of the macro. The
/ENCRYPT command for the first line of the macro has the following syntax:
/ENCRYPT,Encryption_key,File_name,File_ext,Directory_Path/
Where
• Encryption_key is an eight-character password.
• File_name is the name of the encrypted macro filename.
• File_ext is an optional file extension for the encrypted macro file. If you want users to execute
the macro as an "unknown" command, you should use the .mac extension.
• Directory_Path/ is the optional directory path that can contain up to 60 characters; you only
need this argument if you do not want to write the encrypted macro file to your "home" directory.
Note the placement of the /ENCRYPT commands at the top and bottom of the listing in the following
example:
/encrypt,mypasswd,myenfile,mac,macros/
/nopr
/prep7
/view,,-1,-2,-3
block,,arg1,,arg2,,arg3
sphere,arg4
vsbv,1,2
/gopr
finish
/encrypt
The /ENCRYPT command at the top of the macro instructs ANSYS to encrypt the file and use the string
"mypasswd" as the encryption key. It will create an encrypted macro file called myenfile.mac and
place it in the /macros subdirectory of the home directory. The /ENCRYPT command at the bottom
instructs ANSYS to stop the encryption process and write the encrypted macro to the specified file.
81

Note
The encrypted macro uses a /NOPR command as its second line to turn off echoing of ANSYS
commands to the session log file. This is important if you wish to prevent users from reading
the contents of the macro from the session log. It's a good practice to reactivate the session
log by issuing the /GOPR command as the last command in the macro before the ending
/ENCRYPT command.
7.2.Creating an Encrypted Macro
After putting the /ENCRYPT commands at the top and bottom of the macro, you can proceed to create
the encrypted version of the macro. To do this, simply execute the macro through ANSYS. ANSYS will
create the encrypted version with the name and location you specified through the /ENCRYPT command
at the top of the macro. The result should look something like this
/DECRYPT,mypasswd
013^Z,^%
02x^0Se|Lv(yT.6>?
03J3]Q_LuXd3-6=m+*f$k]?eB
04:^VY7S#S>c>
05daV;u(yY
06T]3WjZ
/DECRYPT
Note that the individual commands within the macro are now encrypted, and that the encrypted ma-
terial is enclosed by /DECRYPT commands. The encryption key is the argument to the first /DECRYPT
command.
7.3.Running an Encrypted Macro
You can run an encrypted macro just as you would any other macro; place the encrypted macro within
the macro search path. If you would prefer to run the encrypted macro without having the encryption
key resident in the macro file, you can define the key as a "global encryption key" within ANSYS. To do
this you must first replace the encryption key argument in the /DECRYPT command with the parameter
PASSWORD. Thus, the first line of the encrypted macro becomes:
/DECRYPT,PASSWORD
Before executing the macro within ANSYS, issue the following command through the ANSYS Input
command line:
/DECRYPT,PASSWORD,Encryption_Key
Where Encryption_Key is the encryption key used to encrypt the file. You can now execute the
encrypted password. To delete the current global encryption key, issue the following ANSYS command:
/DECRYPT,PASSWORD,OFF
Chapter 7:Encrypting Macros

Chapter 8: APDL Commands
*ABBR
ABBRES
ABBSAV
*AFUN
*ASK
*AXPY
*CFCLOS
*CFOPEN
*CFWRITE
*COMP
*CREATE
*CYCLE
*DEL
/DFLAB
*DIM
/DIRECTORY
*DMAT
*DO
*DOWHILE
*EIGEN
*ELSE
*ELSEIF
*END
*ENDDO
*ENDIF
*EXIT
*EXPORT
*FREE
*GET
*GO
*IF
/INQUIRE
*ITENGINE
*LSBAC
*LSENGINE
*LSFACTOR
/MAIL
*MFOURI
*MFUN
/MKDIR
*MOPER
*MSG
*MULT
*MWRITE
*NRM
83

PARRES
PARSAV
/PMACRO
*PRINT
/PSEARCH
*REPEAT
*RETURN
/RMDIR
*SET
*SMAT
*SREAD
*STATUS
*TAXIS
/TEE
*TOPER
*TREAD
/UCMD
*ULIB
*USE
*VABS
*VCOL
*VCUM
*VEC
*VEDIT
*VFACT
*VFILL
*VFUN
*VGET
*VITRP
*VLEN
*VMASK
*VOPER
*VPLOT
*VPUT
*VREAD
*VSCFUN
*VSTAT
*VWRITE
/WAIT
Chapter 8:APDL Commands

Appendix A.APDL Gateway Commands
When you need to determine the applicability of a command or a group of commands to a specific
product, the following *GET functions will return a TRUE or a FALSE (a 1 or a 0) value to indicate if the
command in question is valid for your ANSYS product.
Additional *get commands for a new entity=PRODUCT
Entity=PRODUCT,ENTNUM=0 (or blank)
Item1 It1num Item2 It2num Description
pname -P option from Ansys command line
name start 1-n Ansys product name. A character string
of 8 characters is returned starting at
position It2num. Use *dim and *do to get
all 32 characters.
Item1 It1num Description (return values: 1=allowed, 0=not allowed)
/aux12 Check for Ansys gateway command/feature /AUX12
/config Check for Ansys gateway command/feature /CONFIG
/ucmd Check for Ansys gateway command/feature /UCMD
addam Check for Ansys gateway command/feature ADDAM
alphad Check for Ansys gateway command/feature ALPHAD
antype Check for Ansys gateway command/feature ANTYPE
antype static Check for Ansys gateway command/feature ANTYPE,STATIC
antype buckle Check for Ansys gateway command/feature ANTYPE,BUCKLE
antype modal Check for Ansys gateway command/feature ANTYPE,MODAL
antype harmic Check for Ansys gateway command/feature ANTYPE,HARMIC
antype trans Check for Ansys gateway command/feature ANTYPE,TRANS
antype substr Check for Ansys gateway command/feature ANTYPE,SUBSTR
antype spectr Check for Ansys gateway command/feature ANTYPE,SPECTR
arclen Check for Ansys gateway command/feature ARCLEN
betad Check for Ansys gateway command/feature BETAD
blc4 Check for Ansys gateway command/feature BLC4
blc5 Check for Ansys gateway command/feature BLC5
block Check for Ansys gateway command/feature BLOCK
cdread Check for Ansys gateway command/feature CDREAD
con4 Check for Ansys gateway command/feature CON4
cone Check for Ansys gateway command/feature CONE
cqc Check for Ansys gateway command/feature CQC
cyl4 Check for Ansys gateway command/feature CYL4
cyl5 Check for Ansys gateway command/feature CYL5
cylind Check for Ansys gateway command/feature CYLIND
damorph Check for Ansys gateway command/feature DAMORPH
demorph Check for Ansys gateway command/feature DEMORPH
dsum Check for Ansys gateway command/feature DSUM
dvmorph Check for Ansys gateway command/feature DVMORPH
edadapt Check for Ansys gateway command/feature EDADAPT
edbvis Check for Ansys gateway commands/feature EDBVIS
eddc Check for Ansys gateway commands/feature EDDC
edcgen Check for Ansys gateway commands/feature EDCGEN
edclist Check for Ansys gateway commands/feature EDCLIST
edcontact Check for Ansys gateway commands/feature EDCONTACT
edcpu Check for Ansys gateway commands/feature EDCPU
edcrb Check for Ansys gateway commands/feature EDCRB
edcsc Check for Ansys gateway commands/feature EDCSC
edcts Check for Ansys gateway commands/feature EDCTS
85

edcurve Check for Ansys gateway commands/feature EDCURVE
eddamp Check for Ansys gateway commands/feature EDDAMP
edenergy Check for Ansys gateway commands/feature EDENERGY
edfplot Check for Ansys gateway commands/feature EDFPLOT
edhgls Check for Ansys gateway commands/feature EDHGLS
edhtime Check for Ansys gateway commands/feature EDHTIME
edhist Check for Ansys gateway commands/feature EDHIST
edint Check for Ansys gateway commands/feature EDINT
edvel Check for Ansys gateway commands/feature EDVEL
edlcs Check for Ansys gateway commands/feature EDLCS
edldplot Check for Ansys gateway commands/feature EDLDPLOT
edload Check for Ansys gateway commands/feature EDLOAD
edmp Check for Ansys gateway commands/feature EDMP
ednb Check for Ansys gateway commands/feature EDNB
edndtsd Check for Ansys gateway commands/feature EDNDTSD
edout Check for Ansys gateway commands/feature EDOUT
edpart Check for Ansys gateway commands/feature EDPART
edread Check for Ansys gateway commands/feature EDREAD
eddrelax Check for Ansys gateway commands/feature EDDRELAX
edrst Check for Ansys gateway commands/feature EDRST
edshell Check for Ansys gateway commands/feature EDSHELL
edsolve Check for Ansys gateway commands/feature EDSOLVE
edstart Check for Ansys gateway commands/feature EDSTART
edweld Check for Ansys gateway commands/feature EDWELD
edwrite Check for Ansys gateway commands/feature EDWRITE
ekill Check for Ansys gateway commands/feature EKILL
emis Check for Ansys gateway commands/feature EMIS
et Check for Ansys gateway commands/feature ET
etchg Check for Ansys gateway commands/feature ETCHG
fldata Check for Ansys gateway commands/feature FLDATA
flotest Check for Ansys gateway commands/feature FLOTEST
flread Check for Ansys gateway commands/feature FLREAD
fvmesh Check for Ansys gateway commands/feature FVMESH
grp Check for Ansys gateway commands/feature GRP
hropt Check for Ansys gateway commands/feature HROPT
hropt full Check for Ansys gateway commands/feature HROPT,FULL
hropt reduc Check for Ansys gateway commands/feature HROPT,REDUC
hropt msup Check for Ansys gateway commands/feature HROPT,MSUP
igesin Check for Ansys gateway commands/feature IGESIN
igesout Check for Ansys gateway commands/feature IGESOUT
modopt Check for Ansys gateway commands/feature MODOPT
modopt reduc Check for Ansys gateway commands/feature MODOPT,REDUC
modopt subsp Check for Ansys gateway commands/feature MODOPT,SUBSP
modopt unsym Check for Ansys gateway commands/feature MODOPT,UNSYM
modopt damp Check for Ansys gateway commands/feature MODOPT,DAMP
modopt lanb Check for Ansys gateway commands/feature MODOPT,LANB
modopt qrdamp Check for Ansys gateway commands/feature MODOPT,QRDAMP
mooney Check for Ansys gateway commands/feature MOONEY
mp Check for Ansys gateway commands/feature MP
mp ex Check for Ansys gateway commands/feature MP,EX
mp alpx Check for Ansys gateway commands/feature MP,ALPX
mp reft Check for Ansys gateway commands/feature MP,REFT
mp prxy Check for Ansys gateway commands/feature MP,PRXY
mp nuxy Check for Ansys gateway commands/feature MP,NUXY
mp gxy Check for Ansys gateway commands/feature MP,GXY
mp betd Check for Ansys gateway commands/feature MP,BETD
mp alpd Check for Ansys gateway commands/feature MP,ALPD
mp mu Check for Ansys gateway commands/feature MP,MU
mp dens Check for Ansys gateway commands/feature MP,DENS
mp c Check for Ansys gateway commands/feature MP,C
mp enth Check for Ansys gateway commands/feature MP,ENTH

mp kxx Check for Ansys gateway commands/feature MP,KXX
mp hf Check for Ansys gateway commands/feature MP,HF
mp emis Check for Ansys gateway commands/feature MP,EMIS
mp qrate Check for Ansys gateway commands/feature MP,QRATE
mp visc Check for Ansys gateway commands/feature MP,VISC
mp sonc Check for Ansys gateway commands/feature MP,SONC
mp rsvx Check for Ansys gateway commands/feature MP,RSVX
mp perx Check for Ansys gateway commands/feature MP,PERX
mp murx Check for Ansys gateway commands/feature MP,MURX
mp mgxx Check for Ansys gateway commands/feature MP,MGXX
mp hgls Check for Ansys gateway commands/feature MP,HGLS
mp rigid Check for Ansys gateway commands/feature MP,RIGID
mp cable Check for Ansys gateway commands/feature MP,CABLE
mp ortho Check for Ansys gateway commands/feature MP,ORTHO
mp lsst Check for Ansys gateway commands/feature MP,LSST
mpdata Check for Ansys gateway commands/feature MPDATA
mpdata ex Check for Ansys gateway commands/feature MPDATA,EX
mpdata alpx Check for Ansys gateway commands/feature MPDATA,ALPX
mpdata reft Check for Ansys gateway commands/feature MPDATA,REFT
mpdata prxy Check for Ansys gateway commands/feature MPDATA,PRXY
mpdata nuxy Check for Ansys gateway commands/feature MPDATA,NUXY
mpdata gxy Check for Ansys gateway commands/feature MPDATA,GXY
mpdata alpd Check for Ansys gateway commands/feature MPDATA,ALPD
mpdata betd Check for Ansys gateway commands/feature MPDATA,BETD
mpdata mu Check for Ansys gateway commands/feature MPDATA,MU
mpdata dens Check for Ansys gateway commands/feature MPDATA,DENS
mpdata c Check for Ansys gateway commands/feature MPDATA,C
mpdata enth Check for Ansys gateway commands/feature MPDATA,ENTH
mpdata kxx Check for Ansys gateway commands/feature MPDATA,KXX
mpdata hf Check for Ansys gateway commands/feature MPDATA,HF
mpdata emis Check for Ansys gateway commands/feature MPDATA,EMIS
mpdata qrate Check for Ansys gateway commands/feature MPDATA,QRATE
mpdata visc Check for Ansys gateway commands/feature MPDATA,VISC
mpdata sonc Check for Ansys gateway commands/feature MPDATA,SONC
mpdata rsvx Check for Ansys gateway commands/feature MPDATA,RSVX
mpdata perx Check for Ansys gateway commands/feature MPDATA,PERX
mpdata murx Check for Ansys gateway commands/feature MPDATA,MURX
mpdata mgxx Check for Ansys gateway commands/feature MPDATA,MGXX
mpdata lsst Check for Ansys gateway commands/feature MPDATA,LSST
mscap Check for Ansys gateway commands/feature MSCAP
msdata Check for Ansys gateway commands/feature MSDATA
msmeth Check for Ansys gateway commands/feature MSMETH
msnomf Check for Ansys gateway commands/feature MSNOMF
msprop Check for Ansys gateway commands/feature MSPROP
msquad Check for Ansys gateway commands/feature MSQUAD
msrelax Check for Ansys gateway commands/feature MSRELAX
mssolu Check for Ansys gateway commands/feature MSSOLU
msspec Check for Ansys gateway commands/feature MSSPEC
msvary Check for Ansys gateway commands/feature MSVARY
nlgeom Check for Ansys gateway commands/feature NLGEOM
nrlsum Check for Ansys gateway commands/feature NRLSUM
optyp Check for Ansys gateway commands/feature OPTYP
optyp subp Check for Ansys gateway commands/feature OPTYP,SUBP
optyp first Check for Ansys gateway commands/feature OPTYP,FIRST
optyp rand Check for Ansys gateway commands/feature OPTYP,RAND
optyp run Check for Ansys gateway commands/feature OPTYP,RUN
optyp fact Check for Ansys gateway commands/feature OPTYP,FACT
optyp grad Check for Ansys gateway commands/feature OPTYP,GRAD
optyp sweep Check for Ansys gateway commands/feature OPTYP,SWEEP
optyp user Check for Ansys gateway commands/feature OPTYP,USER
opuser Check for Ansys gateway commands/feature OPUSER
pri2 Check for Ansys gateway commands/feature PRI2
prism Check for Ansys gateway commands/feature PRISM
psdcom Check for Ansys gateway commands/feature PSDCOM
psdfrq Check for Ansys gateway commands/feature PSDFRQ
psolve Check for Ansys gateway commands/feature PSOLVE
87

rate Check for Ansys gateway commands/feature RATE
resume Check for Ansys gateway commands/feature RESUME
rpr4 Check for Ansys gateway commands/feature RPR4
rprism Check for Ansys gateway commands/feature RPRISM
save Check for Ansys gateway commands/feature SAVE
se Check for Ansys gateway commands/feature SE
sesymm Check for Ansys gateway commands/feature SESYMN
setran Check for Ansys gateway commands/feature SETRAN
solve Check for Ansys gateway commands/feature SOLVE
sph4 Check for Ansys gateway commands/feature SPH4
sph5 Check for Ansys gateway commands/feature SPH5
sphere Check for Ansys gateway commands/feature SPHERE
spop Check for Ansys gateway commands/feature SPOP
spop sprs Check for Ansys gateway commands/feature SPOP,SPRS
spop mprs Check for Ansys gateway commands/feature SPOP,MPRS
spop ddam Check for Ansys gateway commands/feature SPOP,DDAM
spop psd Check for Ansys gateway commands/feature SPOP,PSD
srss Check for Ansys gateway commands/feature SRSS
tb Check for Ansys gateway commands/feature TB
tb bkin Check for Ansys gateway commands/feature TB,BKIN
tb mkin Check for Ansys gateway commands/feature TB,MKIN
tb miso Check for Ansys gateway commands/feature TB,MISO
tb biso Check for Ansys gateway commands/feature TB,BISO
tb aniso Check for Ansys gateway commands/feature TB,ANISO
tb dp Check for Ansys gateway commands/feature TB,DP
tb anand Check for Ansys gateway commands/feature TB,ANAND
tb melas Check for Ansys gateway commands/feature TB,MELAS
tb user Check for Ansys gateway commands/feature TB,USER
tb creep Check for Ansys gateway commands/feature TB,CREEP
tb swell Check for Ansys gateway commands/feature TB,SWELL
tb bh Check for Ansys gateway commands/feature TB,BH
tb piez Check for Ansys gateway commands/feature TB,PIEZ
tb fail Check for Ansys gateway commands/feature TB,FAIL
tb mooney Check for Ansys gateway commands/feature TB,MOONEY
tb water Check for Ansys gateway commands/feature TB,WATER
tb anel Check for Ansys gateway commands/feature TB,ANEL
tb concr Check for Ansys gateway commands/feature TB,CONCR
tb pflow Check for Ansys gateway commands/feature TB,PFLOW
tb evisc Check for Ansys gateway commands/feature TB,EVISC
tb plaw Check for Ansys gateway commands/feature TB,PLAW
tb foam Check for Ansys gateway commands/feature TB,FOAM
tb honey Check for Ansys gateway commands/feature TB,HONEY
tb comp Check for Ansys gateway commands/feature TB,COMP
tb nl Check for Ansys gateway commands/feature TB,NL
tb nliso Check for Ansys gateway commands/feature TB,NLISO
tb chab Check for Ansys gateway commands/feature TB,CHAB
tb boyce Check for Ansys gateway commands/feature TB,BOYCE
tb eos Check for Ansys gateway commands/feature TB,EOS
torus Check for Ansys gateway commands/feature TORUS
trnopt Check for Ansys gateway commands/feature TRNOPT
trnopt full Check for Ansys gateway commands/feature TRNOPT,FULL
trnopt reduc Check for Ansys gateway commands/feature TRNOPT,REDUC
trnopt msup Check for Ansys gateway commands/feature TRNOPT,MSUP
usrcal Check for Ansys gateway commands/feature USRCAL
v Check for Ansys gateway commands/feature V
va Check for Ansys gateway commands/feature VA
vadd Check for Ansys gateway commands/feature VADD
vcvfill Check for Ansys gateway commands/feature VCVFILL
vdrag Check for Ansys gateway commands/feature VDRAG
vext Check for Ansys gateway commands/feature VEXT
vgen Check for Ansys gateway commands/feature VGEN
vglue Check for Ansys gateway commands/feature VGLUE
vinp Check for Ansys gateway commands/feature VINP

vinv Check for Ansys gateway commands/feature VINV
vlscale Check for Ansys gateway commands/feature VLSCALE
vmesh Check for Ansys gateway commands/feature VMESH
voffset Check for Ansys gateway commands/feature VOFFSET
vovlap Check for Ansys gateway commands/feature VOVLAP
vptn Check for Ansys gateway commands/feature VPTN
vrotat Check for Ansys gateway commands/feature VROTAT
vsba Check for Ansys gateway commands/feature VSBA
vsbv Check for Ansys gateway commands/feature VSBV
vsbw Check for Ansys gateway commands/feature VSBW
vsymm Check for Ansys gateway commands/feature VSYMM
vtran Check for Ansys gateway commands/feature VTRAN
elem i Check to see if Ansys element type "i" is allowed.
limit node Get maximum allowed node number
limit elem Get maximum allowed element number
limit kp Get maximum allowed keypoint number
limit line Get maximum allowed line number
limit area Get maximum allowed area number
limit vol Get maximum allowed volume number
limit dof Get maximum allowed dof number
limit mdof Get maximum allowed master dof number
89

Appendix B.GET Function Summary
A "get function" is available for some items, and can be used instead of the *GET command. The function
returns the value and uses it where the function is input (bypassing the need for storing the value with
a parameter name and inputting the parameter name where the value is to be used). For example, assume
the average X-location of two nodes is to be calculated. Using the *GET command, parameter L1 can
be assigned the X location of node 1 (*GET, L1, NODE, 1, LOC, X), and parameter L2 can be assigned
the X location of node 2, then the mid location can be computed from MID = (L1+L2)/2. However, using
the node location "get function" NX(N), which returns the X location of node N, MID can be computed
directly from MID = (NX(1)+NX(2))/2, without the need for intermediate parameters L1 and L2. Get
functions return values in the active coordinate system unless stated otherwise.
Get function arguments may themselves be parameters or other get functions. The get function
NELEM(ENUM,NPOS) returns the node number in position NPOS for element ENUM. Combining functions,
NX(NELEM(ENUM,NPOS)) returns the X location of that node. Get functions (where available) are shown
with the corresponding *GET items in the tables below and are summarized at the end of this command
description
Get functions are described at the beginning of this command (see the section titled Notes) and are
shown as alternatives to the *GET items where they apply. They are summarized here (grouped by
functionality) for convenience.
Table B.1 *GET - Get Function Summary
"Get Function" Summary
DescriptionEntity Status Get Function
Status of node N: -1=unselected, 0=undefined, 1=selected.NSEL(N)
Status of element E: -1=unselected, 0=undefined, 1=selec-
ted.
ESEL(E)
Status of keypoint K: -1=unselected, 0=undefined, 1=se-
lected.
KSEL(K)
Status of line L: -1=unselected, 0=undefined, 1=selected.LSEL(L)
Status of area A: -1=unselected, 0=undefined, 1=selected.ASEL(A)
Status of volume V: -1=unselected, 0=undefined, 1=selec-
ted.
VSEL(V)
Next Selected Entity
Next selected node having a node number greater than N.NDNEXT(N)
Next selected element having an element number greater
than E.
ELNEXT(E)
Next selected keypoint having a keypoint number greater
than K.
KPNEXT(K)
Next selected line having a line number greater than L.LSNEXT(L)
Next selected area having an area number greater than A.ARNEXT(A)
91

Next selected volume having a volume number greater than
V.
VLNEXT(V)
Locations
Centroid X-coordinate of element E in global Cartesian co-
ordinate system. Centroid is determined from the selected
nodes on the element.
CENTRX(E)
Centroid Y-coordinate of element E in global Cartesian
coordinate system. Centroid is determined from the selected
CENTRY(E)
Centroid Z-coordinate of element E in global Cartesian co-
ordinate system. Centroid is determined from the selected
CENTRZ(E)
X-coordinate of node N in the active coordinate system.NX(N)
Y-coordinate of node N in the active coordinate system.NY(N)
Z-coordinate of node N in the active coordinate system.NZ(N)
X-coordinate of keypoint K in the active coordinate systemKX(K)
Y-coordinate of keypoint K in the active coordinate systemKY(K)
Z-coordinate of keypoint K in the active coordinate systemKZ(K)
X-coordinate of line L at length fraction LFRAC (0.0 to 1.0).LX(L,LFRAC)
Y-coordinate of line L at length fraction LFRAC (0.0 to 1.0).LY(L,LFRAC)
Z-coordinate of line L at length fraction LFRAC (0.0 to 1.0).LZ(L,LFRAC)
X slope of line L at length fraction LFRAC (0.0 to 1.0).LSX(L,LFRAC)
Y slope of line L at length fraction LFRAC (0.0 to 1.0).LSY(L,LFRAC)
Z slope of line L at length fraction LFRAC (0.0 to 1.0).LSZ(L,LFRAC)
Nearest to Location
Number of the selected node nearest the X,Y,Z point (in
the active coordinate system, lowest number for coincident
nodes).
NODE(X,Y,Z)
Number of the selected keypoint nearest the X,Y,Z point
(in the active coordinate system, lowest number for coincid-
ent keypoints).
KP(X,Y,Z)
Distances
Distance between nodes N1 and N2.DISTND(N1,N2)
Distance between keypoints K1 and K2.DISTKP(K1,K2)
Distance between the centroid of element E and node N.
Centroid is determined from the selected nodes on the
element.
DISTEN(E,N)
Angles (in radians by default -- see the *AFUN command)
Subtended angle between two lines (defined by three nodes
where N1 is the vertex node). Default is in radians.
ANGLEN(N1,N2,N3)

Subtended angle between two lines (defined by three key-
points where K1 is the vertex keypoint). Default is in radians.
ANGLEK(K1,K2,K3)
Nearest to Entity
Selected node nearest node N.NNEAR(N)
Selected keypoint nearest keypoint K.KNEAR(K)
Selected element nearest node N. The element position is
calculated from the selected nodes.
ENEARN(N)
Areas
Area of the triangle with vertices at nodes N1, N2, and N3.AREAND(N1,N2,N3)
Area of the triangle with vertices at keypoints K1, K2, and
K3.
AREAKP(K1,K2,K3)
Area at node N apportioned from selected elements attached
to node N. For 2-D planar solids, returns edge area associated
ARNODE(N)
with the node. For axisymmetric solids, returns edge surface
area associated with the node. For 3-D volumetric solids,
returns face area associated with the node. For 3–D, select
all the nodes of the surface of interest before using ARNODE.
Normals
X-direction cosine of the normal to the plane containing
nodes N1, N2, and N3.
NORMNX(N1,N2,N3)
Y-direction cosine of the normal to the plane containing
NORMNY(N1,N2,N3)
Z-direction cosine of the normal to the plane containing
NORMNZ(N1,N2,N3)
X-direction cosine of the normal to the plane containing
keypoints K1, K2, and K3.
NORMKX(K1,K2,K3)
Y-direction cosine of the normal to the plane containing
NORMKY(K1,K2,K3)
Z-direction cosine of the normal to the plane containing
NORMKZ(K1,K2,K3)
Connectivity
Element connected to node N. LOC is the position in the
resulting list when many elements share the node. A zero
is returned at the end of the list.
ENEXTN(N,LOC)
Node number in position NPOS (1--20) of element E.NELEM(E,NPOS)
Returns the bit pattern for the active DOFs at the specified
node.
NODEDOF(N)
bit 0 is UX, bit 1 is UY,... bit 5 is ROTZ
bits 6,7,8 are AX,AY,AZ
bits 9,10,11 are VX,VY,VZ
bit 18 is PRES, bit 19 is TEMP, bit 20 is VOLT, bit 21 is
MAG
bit 24 is EMF, bit 25 is CURR
93

For a node with UX,UY,UZ the return value will be 7
(bits 0,1,2)
For a node with UX,UY,UZ,ROTX,ROTY,ROTZ the return
value will be 63 (bits 0,1,2,3,4,5)
Faces
For 2-D planar solids and 3-D volumetric solids, element
adjacent to a face (FACE) of element E. The face number is
ELADJ(E,FACE)
the same as the surface load key number. Only elements of
the same dimensionality and shape are considered. A -1 is
returned if more than one is adjacent.
Node in position LOC of a face number FACE of element
E. The face number is the same as the surface load key
NDFACE(E,FACE,LOC)
number. LOC is the nodal position on the face (for an IJLK
face, LOC=1 is at node I, 2 is at node J, etc.)
Face number of element E containing the selected nodes.
The face number output is the surface load key. If multiple
NMFACE(E)
load keys occur on a face (such as for line and area elements)
the lowest load key for that face is output.
For 2-D planar solids and 3-D volumetric solids, returns the
area of the face of element E containing the selected nodes.
ARFACE(E)
For axisymmetric elements, the area is the full (360 degree)
area.
Model Information
Element attribute number assigned to element E. Use VAL
= 1 for MATT, 2 for TYPE, 3 for REAL, and 4 for SECN.
EATT(E,VAL)
Real constant value for real table R and location LOC.RCON(R,LOC)
Degree of Freedom Results
UX structural displacement at node N.UX(N)
UY structural displacement at node N.UY(N)
UZ structural displacement at node N.UZ(N)
ROTX structural rotation at node N.ROTX(N)
ROTY structural rotation at node N.ROTY(N)
ROTZ structural rotation at node N.ROTZ(N)
Temperature at node N. For SHELL131 and SHELL132 ele-
ments with KEYOPT(3) = 0 or 1, use TBOT(N), TE2(N), TE3(N),
. . ., TTOP(N) instead of TEMP(N).
TEMP(N)
Pressure at node N.PRES(N)
VX fluid velocity at node N.VX(N)
VY fluid velocity at node N.VY(N)
VZ fluid velocity at node N.VZ(N)
Turbulent kinetic energy (FLOTRAN) at node N.ENKE(N)
Turbulent energy dissipation (FLOTRAN) at node N.ENDS(N)

Electric potential at node N.VOLT(N)
Magnetic scalar potential at node N.MAG(N)
AX magnetic vector potential at node N.AX(N)
AY magnetic vector potential at node N.AY(N)
AZ magnetic vector potential at node N.AZ(N)
Returns information about the data base manager
Number of pages in core.VIRTINQR(1)
Page size in integer words.VIRTINQR(4)
Maximum number of pages allowed on disk.VIRTINQR(7)
Number of read/write operations on page.VIRTINQR(8)
Maximum record number on page.VIRTINQR(9)
Maximum pages touched.VIRTINQR(11)
Returns the current value of ANSYS filtering keywords.
Returns the current value the keyword specified by
KEYWORD. See the ANSYS UIDL Programmer's Guide for a list
of keywords and values.
KWGET(KEYWORD)
Character String Functions Strings must be dimensioned (see *DIM) as a character parameter
or enclosed in single apostrophes ('char').
Functions which return a double precision value of a numeric character string.
a8 is a decimal value expressed in a string.VALCHR(a8)
a8 is an octal value expressed in a string.VALOCT (a8)
a8 is a hex value expressed in a string.VALHEX(a8)
Functions which return an 8 character string of a numeric value.
dp is a double precision variable.CHRVAL (dp)
dp is an integer value.CHROCT (dp)
dp is an integer value.CHRHEX(dp)
Functions which manipulate strings: StrOut is the output string (or character parameter) Str1 and
Str2 are input strings. Strings are a maximum of 128 characters. (see *DIM)
Get the nChar substring starting at character nLoc in Str1.StrOut = STRSUB(Str1, nLoc,nChar)
Add Str2 at the end of Str1.StrOut = STRCAT(Str1,Str2)
Add Str2 to Str1 starting at character nLoc.StrOut = STRFILL(Str1,Str2,nLoc)
Remove all blanks from Str1StrOut = STRCOMP(Str1)
Left-justify Str1StrOut = STRLEFT(Str1)
Get starting location of Str2 in Str1.nLoc = STRPOS(Str1,Str2)
Location of last nonblank characternLoc = STRLENG(Str1)
Upper case of Str1StrOut = UPCASE(Str1)
Lower case of Str1StrOut = LWCASE(Str1)
The following functions manipulate file names.
95

Produces a contiguous pathstring. e.g. directory/filename.extPath String = JOIN ('directory','file-
name','extension')
Produces a contiguous pathstring. e.g. directory/filenamePath String = JOIN ('directory','file-
name')
Produces a separate output of the directory from the path-
string.
SPLIT('PathString', 'DIR')
Produces a separate output of the complete filename (with
extension) from the pathstring.
SPLIT('PathString', 'FILE')
Produces a separate output of the filename from the path-
string.
SPLIT('PathString', 'NAME')
Produces a separate output of the file extension from the
pathstring.
SPLIT('PathString', 'EXT')

Index
A
*ABBR command,3,15
*ABBRES command,5
abbreviations
defined,3
files,5
nesting on toolbar,5
*ABBSAV command,5
*ABCHECK command
defined,77
*ABFINI command,77
*AFUN command,16
ANSYS startup options,9
ANSYS_MACROLIB environment variable,57
APDL
comments,16
defined,1
macros,55
mathematical functions,16
operators,16
APDL Math,47
degree-of-freedom ordering,50
examples,52
matrix and vector sizes,49
procedure,48
AR20 through AR99,62
ARG1 through AR19,62
ARRAY
defined,18
examples,20
array parameters,18
1-D table example,26
ARRAY,18
basics,19
CHAR,18
examples,20
naming conflict,23
defining,22
editing interactively,25
examples,20
filling from a data file,26
filling vectors,25
interpolating values,30
labeling,43
listing,22,32
matrix operations,37
operations,35
plotting,42
specifying values,23
TABLE,18,21
examples,21
writing data files,33
Array parameters
ARRAY
examples,20
*ASK command,14
defined,73
C
*CFCLOS command,58
*CFOPEN command,33,58
*CFWRITE command,14,58
CHAR
defined,18
examples,20
limitation with *VEDIT,25
naming conflict,23
character parameters,12
comment character,16
*CREATE command,57
create macro dialog box,59
*CSET command,74
*CYCLE command,66
defined,68
D
data descriptors,14,33
in messages,76
data files
writing from arrays,33
/DECRYPT command,82
macros
introduction to programming,55
*DIM command,15,22–23
*DO command,66
defined,68
do-loops,66
vector operations,35
do-while,67
E
*ELSE command,64,76
defined,68
*ELSEIF command,14,64,76
defined,68
/ENCRYPT command
defined,81
encrypting macros,81
97

*END command,57
*ENDDO command,66
defined,68
*ENDIF command,64,76
defined,68
/EOF command,60
ETABLE command,8
*EXIT command,66
defined,68
expressions,16
F
FILE command,13
/FILENAME command,13
files
abbreviations,5
Format
data descriptors,33
functions,16
G
*GET command,15
assigning parameters,10
GET functions,11
global encryption key,82
*GO command,63,66
/GOPR command,66,81
GUI
interfacing with,73
H
home directory,57
I
*IF command,14,66,68,76
defined,64
/INPUT command,13,55
L
Array parameters
CHAR
limitation with *VEDIT,25
login directory,57
looping,66–67
M
macros
control functions,63
quick reference,68
creating,56
creating status bar,77
creating STOP button,77
creating with a text editor,59
displaying messages,76
encrypting,81
executing,61
encrypted,82
general examples,71
library files,60
local variables,62
naming,56
nesting,55,63
passing arguments to,62
picking,78
prompting for single parameter,73
prompting with dialog box,74
search path,57
writing to session log,78
matrix manipulation (APDL Math),47
matrix operations,37
messages
types of,76
*MFOURI command,37
*MFUN command,37
*MOPER command,37
examples,37
*MSG command,14
defined,76
MULTIPRO command
defined,74
example,74
N
/NOPR command,81
O
operators,16
order of evaluation,16
/OUTPUT command,13
P
parameters,7,55
_RETURN,77
_RETURN parameter,69
_STATUS parameter,69
array,18 (see array parameters)
assigning ANSYS-supplied values,10
assigning at startup,9
assigning during execution,9
assigning through ANSYS command line,9
assigning through ANSYS Launcher,9
character,12,15
Index

defining,9
deleting,12
dynamic substitution of,15
forcing substitution of,13
listing,11
maximum number,11
PASSWORD,82
preventing substitution of,13
resuming,17
saving,17
substituting numeric values,13
using *GET,10
using get functions,10
using in-line get functions,11
writing,17
Parameters
naming conventions,8
parametric expressions,16
parametric functions,16
PARRES command,14,17
PARSAV command,14,17
passing arguments to macros,62
plotting
array vectors,42
labeling,43
/PMACRO command,78
R
*REPEAT command,66
repeating a command,66
RESUME command,13
parameters
retrieving or restoring parameter values,31
S
*SET command,9,15,23
specification commands
vector and matrix operations,39
start.ans file,9
status bar,77
*STATUS command,11,15,32,39
examples,32
/STITLE command,13,15
STOP button
creating using a macro,77
T
TABLE
defined,18
examples,21
/TEE command,58
text editor,59
/TITLE command,13,15
/TLABEL command,13,15
toolbar
default buttons,3
modifying,3
nesting abbreviations on,5
*TREAD command,23,26
U
UIDL functions
calling in macros,79
/UIS command,76
*ULIB command,61
UNIX shells,9
unknown command
method for executing macros,61
*USE command,61
V
*VABS command,39
*VCOL command,39
*VCUM command,39
vector operations,35
*VEDIT command,15,23
defined,25
*VFACT command,39
example,39
*VFILL command,15,23,35
defined,25,39
*VFUN command,15,35
examples,35,39
*VGET command,15,35
*VITRP command,15,35
*VLEN command,15,39
examples,39
*VMASK command,15,39
example,39
*VOPER command,15,35
examples,35
gather and scatter,35
*VPLOT command
defined,42–43
*VPUT command
defined,31
*VREAD command,14–15,23,26,35,39
*VSCFUN command,15,35
*VSTAT command,39
*VWRITE command,14–15,17,35,39
data descriptors,33
99

W
windows
current directory,57
Index

ANSYS Parametric Design Language Guide

More Related Content

What's hot

Similar to ANSYS Parametric Design Language Guide

More from Pablo Mora

Recently uploaded

ANSYS Parametric Design Language Guide