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Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
Scripting Guide for OpenMatrix Language
OpenMatrix is a mathematical scripting language.
Expressions and Statements
Statements are made of expressions, which may be simple or complex.
Expressions
Expressions are groups of objects that can be combined into a single object. They typically involve literals, identifiers, and operators.

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Learn about the features and functionality available in Compose.
Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
  - Literals
    Literals are items that are constant throughout the life of the application. Literals include numeric, imaginary, characters, strings, logicals, and Other (NaN/Inf).
  - Data Types
    Data types are items that are constant throughout the life of the application and are built into the OpenMatrix language.
  - Strings
    Strings are arrays of characters.
  - Variables and Assignments
    OML language scripts manipulate data through variables. Variables are referred to by their name (alphanumeric) and can be created (assigned) and deleted as described in this section.
  - Indexing
    Indexing is used to retrieve one or more specific values out of a collection.
  - Operators
    Operators are used to combine operands.
  - Operator Descriptions (tables)
    Each operator in this section is explained with the operations of scalars, vectors, and matrices that are allowed for said operator.
  - Expressions and Statements
    Statements are made of expressions, which may be simple or complex.
    - Expressions
      Expressions are groups of objects that can be combined into a single object. They typically involve literals, identifiers, and operators.
    - Statements
      A statement is a complete instruction to the OpenMatrix language. Statements typically combine keywords and expressions.
    - Comments
      Comments can be inserted in scripts.
  - Flow of Control and Looping
    Loops are used to perform the same set of statements multiple times.
  - Workspace and Scoping Rules
    There are two types of workspaces: Local and Global.
  - Functions
    Functions are packets of statements that can be used repeatedly.
  - Scripts and Functions
    OpenMatrix statements persist in .oml files.
  - Files
    This section describes files that can be manipulated by the OpenMatrix Language.
  - Error and Warning Messages
    Errors and warning messages are both output in the console (or the Command Window in GUI mode) of Compose.
  - Plotting and Visualization
    Create 2D and 3D plots and control their style and appearance.
  - Objects in OpenMatrix Language
    Objects in OML are defined using the classdef keyword. This creates a blueprint for an object but does not actually create (instantiate) anything.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
- Python in Compose Reference Guide
Appendix
Get help for the optional libraries that are available in the Extension Manager.
Frequently Asked Questions
You've got questions? We've got answers!

Expressions

Expressions are groups of objects that can be combined into a single object. They typically involve literals, identifiers, and operators.

Whitespace (spaces and tabs) is generally ignored in expressions. Thus:

1  +  1, 
1 +1
1+1

all equal 2.

Expressions can be used in collections as well.

[1 + 1] => [2]

Expressions are a basic type of statement. Most statements contain a combination of keywords and expressions.