"Unable to Resolve Name set.Y_i" | Error with using object setter functions

I'm using a setter function for an object in a test program, but each time I try to use it, I get an error "Unable to resolve the name set.Y_i". I believe this is an issue with file locations, based on a few Google searches I've made on the issue, but I've found nothing helpful.

Here's the relavant code from the test file (test input is "5", or some other small number):

myLauncher = launcher(ini_height_launcher,ini_height_target,ini_velocity,distance_to_target,angle_of_lancher,bool_isCocked,rotatingBase_angle);
input2 = input('Change launcher''s height (meters): ');
myLauncher = set.Y_i(myLauncher,input2);

Here's the set function (I've tested it without the NAN check, same error):

 function obj = set.Y_i(obj, A)
            if(~isnan(A))
            obj.Y_i = A;
            else
            fprintf("Function: set.Y_i\nInput is not a number!\n");
            end
 end
 

Answer 1

[Steven Lord]

As per the first Note on this documentation page "You cannot call property access methods directly. MATLAB calls these methods when you access property values."

If Y_i is a property of the launcher class (of which myLauncher is an instance) then your third line should be:

myLauncher.Y_i = input2;

You may want your property set method to throw an error instead of simply displaying a message. Users can (and often do) ignore status messages displayed by functions. It is possible to ignore an error (usually using a try / catch block) but you have to work a little more to ignore it.