Why do I get the error "First argument must be text" when using 'strlength'?

Why do I get the error "First argument must be text" when using 'strlength'?

Answer 1

[MathWorks Support Team]

This error message can occur when passing an invalid string to 'strlength'. Here are a few examples that produce the error in MATLAB R2023b:

>> str = {num2str(repmat(2,4,1))};
>> strlength(str)
Error using strlength
First argument must be text.

>> strlength({('test')'})
Error using strlength
First argument must be text.

>> strlength(inf)
Error using strlength
First argument must be text.

Note that the input to 'strlength' must be a valid string array, character vector, or cell array of character vectors.

See the 'strlength' documentation for valid examples:

https://www.mathworks.com/help/matlab/ref/strlength.html