Variable-Size Data

Definition, differences for code generation, 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 for which you intend to generate C/C++ code, follow the described guidelines. Certain restrictions apply to the use of variable-size data in MATLAB code that is intended for code generation. Learn techniques to control dynamic memory allocation and improve performance of the generated code. You can also dynamically allocate memory for fixed-size arrays, see Control Memory Allocation for Fixed-Size Arrays.

Functions

coder.varsize Declare variable-size data

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.
Generate Code for Variable-Size Data
Generate code for data whose size might change at run time.
Specify Upper Bounds for Variable-Size Arrays
To avoid dynamic memory allocation, specify upper bounds for a variable-size array.
Use C Arrays in the Generated Function Interfaces
Understand and use arrays from the generated function interfaces
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.