How to modify properties of a Matlab Object

matlab, matlab-class, properties

Solution

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

Problem

I've created a MATLAB class, something like: ``` 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?

Original source

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