Dati di dimensione variabile

Definizione e differenze per la generazione di codice

È possibile specificare le variabili nei blocchi MATLAB Function e MATLAB System come dimensione variabile, ovvero dati la cui dimensione non è nota in fase di compilazione o cambia in fase di esecuzione.

Blocchi

MATLAB Function	Include MATLAB code in Simulink models
MATLAB System	Include System object in model

Funzioni

`coder.areUnboundedVariableSizedArraysSupported`	Check if current configuration settings allow unbounded variable-size arrays (Da R2024a)
`coder.varsize`	Declare variable-size data

Argomenti

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
Model unknown size data using dynamic arrays.
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.

Risoluzione dei problemi

Diagnose and Fix Variable-Size Data Errors

Troubleshoot size mismatch and upper bounds detection errors.

Esempi in primo piano

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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