How can I combine mustBeA and mustBeNumeric in argument validation functions

Hallo All,

I am new to argument validation functions. I would to parse a 'double', 'ss' or 'tf' data type to my function as follows:

>> LSfunc(Controller)

The LSfunc is a example function to get my question accross. The function looks look this:

function Out = LSfunc(In)

% Check arguments

arguments

In (1,1) {mustBeA(In, "tf", "ss")

end

% Convert numeric to ss data-type

In = ss(In)

% Whenever the data type is ss print: "Great job!"

if isa(In, 'ss')

display('Great job!');

end

end

As you can see I do not have a problem with allowing the input In to be any numeric because I convert it inside the function.

So my question boils down to this:

How can I combine mustBeA(In, "tf", "ss") and mustBeNumeric(In)? (P.S. Yes, I could convert the input before it enters the function but I do not want this because my script gets quit long this way)

Thanks for the help!

With kind regards,

Luuk

Answer 1

[Matt J]

You could write your own custom validation function for such a purpose, e.g.,

% Custom validation function
function mustBeNumericOrListedType(a,varargin)

     if ~isnumeric(a) && ~ismember(class(a),cellstr(varargin))
        eid = 'Type:notValid';
        msg = 'Argument must be numeric or one of the prescribed types';
        throwAsCaller(MException(eid,msg))
    end
end

[Luuk Spin]

Thank you :). That will do the trick