Home
API, Reference Guides
Overview of external readers and the Altair Binary Format, the generic ASCII reader, running applications in batch mode, using Tcl/Tk commands, translators, and result math.
Tcl/Tk Commands
The application's scripting interface is a set of Tcl/Tk commands that follow a simple and consistent syntax.
Tcl/Tk Commands
Tcl/Tk classes for the following Altair HyperWorks applications.
MotionView
mdlIDataMember Class
mdlIDataMember TestExpression
Tests the evaluation of an expression without re-evaluating the entire model.

Welcome
What's New
View new features for version 2024.1.
Get Started
Learn the basics and discover the workspace.
Tutorials
Discover product functionality with interactive tutorials.
API, Reference Guides
Overview of external readers and the Altair Binary Format, the generic ASCII reader, running applications in batch mode, using Tcl/Tk commands, translators, and result math.
- Extensions
  Extensions are programs integrated with the application to enhance or extend the user experience.
- External Readers and Altair Binary Format
  Altair Binary Format (ABF) is the standard binary format read by the program. A library called abflib allows you to create files in ABF.
- Generic ASCII Reader
  A generic ASCII reader is now available which allows you to bring custom results directly into HyperView. The Altair ASCII format is useful for reading the results of any in-house or propriety codes which are saved in a generic format.
- Batch Mode
  Batch mode allows you perform a series of operations outside the program interface.
- External Resources
  External resources can be registered in preference files, session files, or Templex files. If an external resource is registered in a program session, it is automatically registered in the session file when the session is saved.
- Python API
  The Python API documentation for HyperMesh applications.
- Tcl/Tk Commands
  The application's scripting interface is a set of Tcl/Tk commands that follow a simple and consistent syntax.
  - Program with APIs for Beginners
    APIs can be used to perform various actions in an application. For example, the AddPage API can be used to add a page within the project.
  - Object Hierarchy
    Overview of object hierarchy for HyperView, HyperGraph, HyperMesh, MotionView, MediaView and TextView.
  - Tcl/Tk Classes
    Links to the introductory pages for the Tcl/Tk commands that can be used in HyperView, MotionView, HyperGraph, HyperGraph 3D, TextView and MediaView.
  - Script Use Cases
    Examples of script uses cases.
  - Tcl/Tk Example
    Learn more about Tcl/Tk with this basic example.
  - Program with Tcl/Tk Command Tutorials
    Learn more about programming with Tcl/Tk commands with this tutorial.
  - Tcl/Tk Commands
    Tcl/Tk classes for the following Altair HyperWorks applications.
    - Framework
    - MotionView
      - mdlIDataMember Class
        mdlIDataMember Evaluate
        Evaluates the data member to update the new values.
        mdlIDataMember GetEnumList
        Gets the list of valid enumeration values for this data member.
        mdlIDataMember GetErrorCode
        Gets the code of the last error which occurred.
        mdlIDataMember GetEvaluatedValue
        Gets the evaluated value of the expression assigned to the data member.
        mdlIDataMember GetRawExpression
        Gets the raw expression used to specify the value of the current data member.
        mdlIDataMember GetRefObjectHandle
        Gets the handle of the object to which a reference data member is resolved to.
        mdlIDataMember GetRefType
        Gets the type of entity used to resolve this data member.
        mdlIDataMember IsConst
        Determines whether the value of the current data member may or may not be modified.
        mdlIDataMember IsObsolete
        Determines whether or not a data member is obsolete.
        mdlIDataMember IsOverridden
        Determines if the value has been modified.
        mdlIDataMember IsResolved
        Determines whether or not a reference data member is resolved.
        mdlIDataMember IsSlave
        Determines if this data member is for the slave side of a symmetric pair.
        mdlIDataMember SetAsObsolete
        Marks a data member as obsolete so that the next evaluation evaluates that data member.
        mdlIDataMember SetRawExpression
        Used to set expressions for a data members.
        mdlIDataMember TestExpression
        Tests the evaluation of an expression without re-evaluating the entire model.
      - mdlIFlexbody Class
      - mdlIModel Class
      - mdlIModelClient Class
      - mdlIObject Class
      - ::model Procedures
    - HyperView
    - HyperGraph 2D
    - HyperGraph 3D
    - MediaView
    - TextView
    - HgTrans
    - TableView
    - Postquery Commands
    - Context Commands
    - Framework Commands
- Translators
  Translators are utilities that are run from the command line of the operating system to convert various types of files into different formats.
- Result Math
  XML commands in the Result Math Module.
- HWC Console
  Record playback workflows in the application.
- HyperMesh Report
- Task Manager
  Use the Task Manager to load an XML file that defines tasks and their attributes.
- HyperMesh
- MotionView
- Templex and Math Reference Guide
- Script and Model Library
  The Script and Model Library is a database of freely accessible scripts and models posted by users and Altair engineers.

View All Altair HyperWorks Help

mdlIDataMember TestExpression

Tests the evaluation of an expression without re-evaluating the entire model.

Syntax

mdlIDataMember_handle TestExpression

Application

MotionView Tcl Modify

Description

This command tests the evaluation of an expression without re-evaluating the entire model.

Example

To test the expression specified for the point’s y value:

Note: Load the slider_crank.mdl before running the example code below.

hwi OpenStack
hwi GetSessionHandle mySessionName 
mySessionName GetProjectHandle myProjectName 
set activePageNum [myProjectName GetActivePage]
myProjectName GetPageHandle myPageName $activePageNum
set activeWinNum [myPageName GetActiveWindow]
myPageName GetWindowHandle myWindowName $activeWinNum
myWindowName GetClientHandle myClientName 
myClientName GetModelHandle myModelName 
myModelName GetChildHandle point_handle p_conrod_cg0
point_handle GetChildHandle myhandle y
myhandle SetRawExpression  "3/0"
myhandle TestExpression
myhandle ReleaseHandle
point_handle ReleaseHandle
myModelName ReleaseHandle
myClientName ReleaseHandle
myWindowName ReleaseHandle
myPageName ReleaseHandle
myProjectName ReleaseHandle
mySessionName ReleaseHandle
hwi CloseStack

Errors

If successful, the evaluated value of the expression is returned. Otherwise, a description of the error in the expression syntax is returned.