Variable-Size Data

Definition and differences for code generation

You can specify variables in MATLAB Function and MATLAB System blocks as variable-size, which is data whose size is not known at compile time or changes at run time.

Blöcke

MATLAB Function	Include MATLAB code in models that generate embeddable C code
MATLAB System	Include System object in model

Funktionen

coder.varsize Declare variable-size data

Themen

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.
Declare Variable-Size MATLAB Function Block Variables
Allow variables defined in MATLAB Function blocks to change size during simulation.
Unbounded Variable-Size Signals
Use unbounded variable-size signals to carry data whose size is unknown during model compilation.
Define Variable-Size Data for Code Generation
Choose a method for defining variable-size data.
Use Dynamic Memory Allocation for Variable-Size Arrays in a MATLAB Function Block
Generate C/C++ code that uses dynamic memory allocation.
Control Memory Allocation for Variable-Size Arrays in a MATLAB Function Block
Disable dynamic memory allocation or specify a dynamic memory allocation threshold for MATLAB Function blocks.
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.

Fehlersuche

Diagnose and Fix Variable-Size Data Errors

Troubleshoot size mismatch and upper bounds detection errors.

Enthaltene Beispiele

Unbounded Variable-Size Signal Basic Operations

Use unbounded variable-size signals in Simulink® modeling. For more information about the general concept of unbounded variable-size signals, see Unbounded Variable-Size Signals.

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