mustBeMember validation problem failure

This class fails property validation on construction

classdef validationTester
    properties
        coupling (1,:) char {mustBeMember(coupling,{'DC', 'AC'})} = 'DC'
    end % public properties
end % classdef

with message

>> vt = validationTester
Error setting default value of property 'coupling' of class 'validationTester'. Value must be a
member of this set:
    'DC'
    'AC' 

Why is this?

Answer 1

[RST]

Self answer.

The char array is being forced into a column vector not the intended row vector. We want the size to be constrained to (1,:) not (:,1).

We should have:

classdef validationTester
    properties
        coupling (1,:) char {mustBeMember(coupling,{'DC', 'AC'})} = 'DC'
    end % public properties
end % classdef