There are special considerations when you create MATLAB® functions that are intended for code generation. These include certain
restrictions when you use
varargout, 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. 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
|Declare a function as extrinsic and execute it in MATLAB|
|Prevent use of constant value of expression for function specializations|
|Prevent code generator from creating function specializations for constant-size expressions|
|Apply element-wise binary operations without implicit expansion|
|Disable implicit expansion within the specified function in the generated code|
- 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
- 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.
Nonconstant Index into varargin or varargout in a for-Loop
Force loop unrolling when the code generator cannot
determine the value of the index into
Avoid Duplicate Functions in Generated Code
Reduce the occurrence of duplicate functions in the generated code.
Output Variable Must Be Assigned Before Run-Time Recursive Call
Troubleshoot output variable assignment for run-time recursion.
Compile-Time Recursion Limit Reached
Troubleshoot compile-time recursion limit error.
Resolve Error: Size Mismatches
Troubleshoot size mismatch errors that occur during code generation.
Resolve Issue: coder.inline('never') Does Not Prevent Inlining of Function
Troubleshoot instances of