Function Definition - MATLAB & Simulink (original) (raw)

Main Content

Defining and calling functions for code generation

There are special considerations when you create MATLAB® functions that are intended for code generation. These include certain restrictions when you use varargin andvarargout, recursive functions, anonymous functions, and nested functions. To generate code for MATLAB recursive functions, the code generator uses either compile-time recursion or run-time recursion. To produce efficient C/C++ code, the code generator sometimes creates multiple versions of a function, referred to as function specializations. In certain cases, you can prevent the code generator from creating function specializations by using coder.ignoreSize and coder.ignoreConst. While generating a MEX function, you can bypass code generation for a specific function in your MATLAB code and instead use the MATLAB engine to execute the call. To do this, use the coder.extrinsic construct.

Functions

Topics

• Compilation Directive %#codegen
  Indicate that a MATLAB function is intended for code generation.
• Generate Code With Implicit Expansion Enabled
  The code generator introduces modifications in the generated code to accomplish implicit expansion.
• Optimize Implicit Expansion in Generated Code
  Implicit expansion in the generated code is enabled by default.
• Code Generation for Variable Length Argument Lists
  Generate code for varargin andvarargout.
• Generate Code for arguments Block That Validates Input and Output Arguments
  Generate code for MATLAB code that constrains class, size, and other aspects of function input and output values.
• Code Generation for Recursive Functions
  Use recursive functions in MATLAB code that is intended for code generation.
• Force Code Generator to Use Run-Time Recursion
  Rewrite your MATLAB code so that the code generator uses run-time recursion instead of compile-time recursion.
• Code Generation for Anonymous Functions
  Use anonymous functions in MATLAB code intended for code generation.
• Code Generation for Nested Functions
  Use nested functions in MATLAB code intended for code generation.
• Resolution of Function Calls for Code Generation
  The code generator uses precedence rules to resolve function calls.
• Resolution of File Types on Code Generation Path
  The code generator uses precedence rules to resolve file types.
• Use MATLAB Engine to Execute a Function Call in Generated Code
  If a function is not supported for code generation, declare it as_extrinsic_ to execute in MATLAB.

Troubleshooting