How to modify properties of a Matlab Object

Question

I 've created a Matlab Class, something like that :

classdef myclass

properties x_array = []; end

methods function increment(obj,value) obj.x_array = [obj.x_array ; value); end end end

The problem is, the property "x_array" is never modified when i invoke the increment() function: ex:

s = myclass increment(s,5)

s.x_array ans = []

I did some research, and I reached a conclusion that this is because of Matlab using Lazy Copy for objects, making my class inherit the HANDLE class should have solved this, but it didn't, does anybody know why this is happening ? and if extending the handle class is indeen the solution, isn't this the right way to do it:

classdef myclass < handle

or are there any extra steps ? Thanks in advance

Answer 1

This is similar to this question. In short all you should have to do is inherit from handle class.

Quick example

Contents of file myclass.m

classdef myclass<handle
    properties
        x_array = []
    end
    methods
        function obj=increment(obj,val)
            obj.x_array=[obj.x_array val];
        end
    end
end

Now from the Matlab command prompt, you can do the following

>> s=myclass;
>> s.increment(5)
>> s.increment(6)
>> s

s = 

myclass handle

properties:
    x_array: [5 6]

lists of methods, events, superclasses