2023

Home
Reference Guides
Explore the Extended Definitions, OML Guides, Block Library, API Guide and Glossary.
Reference Guide for OpenMatrix Language Functions
The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
System Commands
getpid
Returns the current process ID.

What's New
Get Started
Tutorials
User Guide
Reference Guides
Frequently Asked Questions

What's New
Discover new features and enhancements.
Get Started
New to Twin Activate? Learn the basics here.
Tutorials
Start using Twin Activate with our interactive tutorials.
User Guide
Learn about the features and functionality available in Twin Activate.
Reference Guides
Explore the Extended Definitions, OML Guides, Block Library, API Guide and Glossary.
- Extended Definitions for Advanced Users
  PDF file with in-depth information on key topics in the User's Guide.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
  - ABF Commands
  - Altair Integration Commands
  - Audio Commands
  - CAE Commands
  - CAE Reader Commands
  - CAE Reader 3D Commands
  - CAE Writer Commands
  - Calculus Commands
  - Computer Vision Commands
  - Control System Commands
  - Core Minimal Interpreter Commands
  - Data Structure Commands
  - Differential Equations Commands
  - Elementary Math Commands
  - File I/O Commands
  - Geometry Commands
  - GUI Commands
  - HDF5 Reader Commands
  - HDF5 Writer Commands
  - hstpyfit Commands
  - Image Commands
  - Library Manager Commands
  - Linear Algebra Commands
  - Logical Commands
  - Machine Learning Commands
  - Optimization Commands
  - Plotting Commands
  - Polynomial Math Commands
  - Signal Processing Commands
  - Statistical Analysis Commands
  - String Operations Commands
  - System Commands
    - cd
      Changes the current directory to dir.
    - chdir
      Changes the current directory to dir.
    - cputime
      Returns the current cputime used by Twin Activate.
    - createdistributable
      Create a distributable encrypted file to be used with Compose Light. The file is automatically recognized by the operating system as a Compose Light file.
    - date
      Returns the current date as a string in the format DD-MMM-YYYY.
    - delete
      Deletes the file(s), f, or a graphic object, h.
    - diary
      Records all commands and outputs of an interactive session to a file. If no arguments are passed, the diary state is toggled. To save outputs when running a script (non-interactive session), use outputlog.
    - dir
      Directory listing of the current or specified directory.
    - dos
      Executes a dos command on Windows.
    - encryptfile
      Encrypts a OML file.
    - filesep
      Returns the path separator, dependent on the system.
    - genpath
      Creates a path with the directory and sub-directories under dir.
    - getpid
      Returns the current process ID.
    - ls
      Displays information and contents of file(s) or directories.
    - make_absolute_filename
      Creates an absolute path with input name, without checks made for the existance of the path on disk.
    - mkdir
      Creates the directory newdir in the current working directory by default.
    - outputlog
      Records all outputs to a file. If no arguments are passed, the outputlog state is toggled.
    - rmdir
      Removes the directory dir.
    - startupscript_edit
      Opens the user startup script for editing (GUI application only).
    - startupscript_path
      Shows the path to the user startup script.
    - system
      Executes the shell command stringCommand. If executed in 'sync' mode or without additional inputs, the application waits until the execution is complete. If executed in 'async' mode, stringCommand is executed in a detached thread and control is returned to the application immediately.
    - unix
      Executes the unix shell command stringCommand.
  - Table Commands
  - Time Commands
  - Trigonometry Commands
  - OML to Python Bridge Commands
  - Python to OML Bridge Commands
- Block Reference Guide
  Describes all of the blocks in the installed Twin Activate library.
- Function Guide for Twin Activate
  Provides information about developing and simulating models through the Twin Activate Application Program Interface.
- Glossary
  Key terms associated with the software.
Frequently Asked Questions
You've got questions? We've got answers!

2023

Home
...
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
- Reference Guides
  Explore the Extended Definitions, OML Guides, Block Library, API Guide and Glossary.
- System Commands
getpid
Returns the current process ID.

What's New
Get Started
Tutorials
User Guide
Reference Guides
Frequently Asked Questions

ON THIS PAGE

Syntax
Outputs
Examples

getpid

Returns the current process ID.

Syntax

R = getpid

Outputs

R: Current process ID.; Type: integer

Examples

Get the current process ID:

R = getpid

R = 16832

ON THIS PAGE

Syntax
Outputs
Examples

© 2023 Altair Engineering, Inc. All Rights Reserved.

Intellectual Property Rights Notice | Technical Support | Cookie Consent

☼