namelengthmax

R2026b

Maximum identifier length

Syntax

l = namelengthmax

Description

l = namelengthmax returns the maximum length allowed for MATLAB^® identifiers. MATLAB identifiers include:

• Variable names

• Structure field names

• Script, function, and class names

Use the namelengthmax function instead of hard-coding a specific maximum name length into your programs. Then, if the identifier length changes in a future MATLAB release, it is not necessary to update this limit in your code.

Note

The maximum allowed identifier length for model names is 150.

Examples

Determine Maximum MATLAB Identifier Length

l = namelengthmax

l = 
2048

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™. (since R2024b)

GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

The namelengthmax function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Version History

Introduced before R2006a

R2025a: Maximum MATLAB identifier length increased to 2048

The maximum allowed identifier length is increased to 2048. This change allows variables, functions, classes, and many other entities to have names of up to 2048 characters. Longer identifiers negatively impact performance and memory. Operating systems may have maximum file name lengths that are shorter than this limit.

This change does not apply to model names. The maximum allowed identifier length for model names is 150.