MATLAB: How to pass arrays to class properly

Question

I have 3 arrays

a=[[1;2;3],[4;5;6],[7;8;9]]
b=[[3,2,1],[6,5,4],[9,8,7]]
c=[3 6 9]
inst=myclass;
inst.myfunc(arr1, arr2, arr3);

and I delivered it to my class

classdef myclass
    properties
        a;
        b;
        c;
    end
    methods
        function obj=myfunc(obj, arr1, arr2, arr3)
            obj.a=arr1;
            obj.b=arr2;
            obj.c=arr3;
        end
    end
end

the result says

myclass.a=[]

same for the other properties

why this happens? and how to fix it?

I had thought that this is something to do with class instructor

so I made empty class constructer and added it to methods

function obj=myclass(obj)
    
end

and fixed 'inst' too

inst=myclass();

same error had occured.

How to pass arrays to function properly?

Answer 1

The class you defined is called value class in MATLAB. The didn't directly modify the instance of the class. You need to assign it yourself

inst = inst.myfunc(arr1, arr2, arr3);

Your current code will also work, if you define your class as handle class, in that case

classdef myclass < handle
    properties
        a;
        b;
        c;
    end
    methods
        function obj=myfunc(obj, arr1, arr2, arr3)
            obj.a=arr1;
            obj.b=arr2;
            obj.c=arr3;
        end
    end
end

Read more about handle class here: https://www.mathworks.com/help/matlab/handle-classes.html