Set object property in object method

I am looking for a way to set the value of a property in a class from withtin a method in that same class, but I am unable to find out how to do it. I have made a very simple example of what I want to do in the function updateObj below:

classdef myClass
properties
    x
    y
end

methods
    function obj = myClass(xInit, yInit)
        obj.x = xInit;
        obj.y = yInit;
    end

    function updateObj(obj)
        if obj.x==7
            obj.y = 4;
        end
    end

end
end

I would like to be able to call the updateObj function using

myObj = myClass(0,0);
myObj.x = 7;
myObj.updateObj;

and then I want myObj.y to return 4, but it will return 0. I understand the reason for this, but I do not know how to change my updateObj function to get the desired result.

[per isakson]

This would have worked for a handle class, i.e. myClass < handle

Answer 1

[Niklas Nylén]

I found a solution to this, change the updateObj function to return obj like this

function obj = updateObj(obj)
    ...
end

and call it with

myObj = myObj.updateObj;