Variable-Size Data

Variable-size data for code acceleration, dynamic memory allocation

Variable-size data is data whose size is not known at compile time or changes at run time. To use variable-size data in your MATLAB^® code which you intend to accelerate or convert, follow the described guidelines. Certain restrictions apply to the use of variable-size data in MATLAB code that is intended for algorithm acceleration or fixed-point conversion.

Functions

`coder.areUnboundedVariableSizedArraysSupported`	Check if current configuration settings allow unbounded variable-size arrays (Since R2024a)
`coder.varsize`	Resolve size mismatch errors and declare upper bounds

Topics

Code Generation for Variable-Size Arrays
Variable-size data is data whose size is not known at compile time or whose size can change at run time.
Define Variable-Size Data for Code Generation
Choose a method for defining variable-size data.
Control Memory Allocation for Variable-Size Arrays
Control when dynamic memory allocation is used.
Specify Upper Bounds for Variable-Size Arrays
To avoid dynamic memory allocation, specify upper bounds for a variable-size array.
Incompatibilities with MATLAB in Variable-Size Support for Code Generation
Sometimes, the results for variable-size data in generated code are different than the results in MATLAB.
Variable-Sizing Restrictions for Code Generation of Toolbox Functions
Some restrictions for variable-size data apply to multiple toolbox functions.

Troubleshooting

Diagnose and Fix Variable-Size Data Errors

Troubleshoot size mismatch and upper bounds detection errors.

Resolve Issue: coder.varsize Not Supported for Strings

Troubleshoot code generation error when using coder.varisze with string variables.