namelengthmax — Return the maximum MATLAB identifier length.
namelengthmax returns the maximum number of characters allowed in MATLAB identifiers. RunMat reports 2048, matching current MATLAB behavior.
Syntax
l = namelengthmaxReturns
| Name | Type | Description |
|---|---|---|
l | NumericArray | Maximum supported MATLAB identifier length. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:namelengthmax:InvalidArgument | Any input argument is supplied. | namelengthmax: expected no input arguments |
How namelengthmax works
- Accepts no input arguments and returns a double scalar.
- The shared identifier validator uses the same value for
isvarname,genvarname, struct field-name validation, and argument-validation helpers. - Identifiers longer than
namelengthmaxare rejected byisvarnameand repaired or truncated by compatibility helpers that generate names.
Examples
Read the identifier length limit
l = namelengthmaxExpected output:
l = 2048Use the limit when validating generated names
name = repmat('a', 1, namelengthmax);
tf = isvarname(name)Expected output:
tf = logical(1)Using namelengthmax with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how namelengthmax changes the result.
Run a small namelengthmax example, explain the result, then change one input and compare the output.
FAQ
Why is the value 2048 rather than 63?⌄
Older MATLAB releases used 63. Current MATLAB releases report 2048, and RunMat follows the current compatibility surface.
Does this run on the GPU?⌄
No. This is a language metadata constant and always returns a host scalar.
Related Introspection functions
addprop · assignin · class · clear · clearAllMemoizedCaches · clearCache · clearvars · dbclear · dbstack · dbstatus · dbtype · evalc · feval · findprop · getcallinfo · inputParser · isa · ischar · isdeployed · iskeyword · ismethod · isobject · isstring · isUnderlyingType · keyboard · matlab.metadata.DynamicProperty.delete · memoize · metaclass · mislocked · mlock · munlock · narginchk · nargoutchk · notify · onCleanup · stats · str2func · superclasses · underlyingType · verLessThan · version · which · who · whos
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how namelengthmax is executed, line by line, in Rust.
- View the source for namelengthmax in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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