How to pass arrays to class properly?

Question

NoYeah 2020-4-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520380-how-to-pass-arrays-to-class-properly

编辑： NoYeah 2020-4-24

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?

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Answer 1

Ameer Hamza 2020-4-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520380-how-to-pass-arrays-to-class-properly#answer_428075

编辑：Ameer Hamza 2020-4-24

在 MATLAB Online 中打开

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