Can't configure predifined char arguments in a function

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I'm trying to create a function to work with structures, specifically to write information in any field.
I know I could use "structure.fieldA.fielB = data" but for the final application I'm looking for a cleaner code. That's why I'm doing this function.
Its declaration and arguments definition is the next:
function [s] = add2element(s, element, field, data)
arguments
s
element {mustBeInteger} = 1
field {mustBeText} = 'Points'
data {mustBeFinite} = 0
end
% Here next is the body of the function, not important right now
end
But when I try to call the function the following error raises:
>> example_s = add2element(example_s, 1, 'Points', 5)
Unrecognized function or variable 'mustBeText'.
Error in add2element
I've written the arguments block by looking at the Argument Validation Functions page and I don't understand why I get this error. The following are the tests I've done with no results:
  • I've tried with both validations 'mustBeText' and 'mustBeTextScalar'.
  • The field 'Points' was written in a variable field_name = 'Points'

Accepted Answer

Ameer Hamza
Ameer Hamza on 11 Dec 2020
Edited: Ameer Hamza on 11 Dec 2020
mustBeText and mustBeTextScalar were both introduced in R2020b; you cannot use them in R2020a. MATLAB does not provide any validation function for text validation in R2020a: https://www.mathworks.com/help/releases/R2020a/matlab/matlab_prog/argument-validation-functions.html. You can define your own validation function
function myValidationFun(x)
if ~ischar(x)
error('Not a char.');
end
end
place it on MATLAB's path and then in your argument list, specify this validation function for field like this
field {myValidationFun} = 'Points'

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