While working on a project, I found an interesting error when using custom argument validation functions on name-value arguments. I constructed this contrived example class to demonstrate:
classdef Dog
properties
Name
HouseNumber = []
end
methods
function obj = Dog(Name, NameValueArgs)
arguments
Name (1,1) string
NameValueArgs.HouseNumber double {Dog.mustBeScalarOrEmpty(NameValueArgs.HouseNumber)}
end
obj.Name = Name;
if isfield(NameValueArgs, 'HouseNumber')
obj.HouseNumber = NameValueArgs.HouseNumber;
end
end
end
methods (Static = true)
function mustBeScalarOrEmpty(var)
if ~(isscalar(var) || isempty(var))
error('Not scalar nor empty.');
end
end
end
end
When the following is run:
dog1 = Dog("Test",'HouseNumber',23)
This error is produced:
Error using Dog
Invalid name-value argument 'HouseNumber'. Index exceeds the number of array elements (1).
I'm not understanding why this error is being triggered. Is it not valid to call a static method from the class as a custom argument validation function?
