Cannot accèss methods of an Object after modified

I have following codes as junk.m & junk2.m

 classdef junk
 properties
   myValue = []; 
 end 
    methods 
        function obj = junk() % constructor
            obj.myValue = 11;
        end

        function obj = me()
        end
    end
end

 function junk2()

   obj = junk(); % construct an object of myClass
   obj.myValue = 2; % set some fancy values to the object

   obj2 = myFunction(obj); % pass the object to a nice function

   disp(obj2.myValue) % verify that myValue has changed

 end

 function obj = myFunction(obj3)
    obj.myValue = obj3.myValue + 1;
 end

When I call this function I get following output for methods

 methods(obj2)

 Methods for class struct:

 amd          ctranspose   fieldnames   ichol        linsolve     permute      struct2cell  
 cholinc      display      fields       ilu          luinc        reshape      transpose    

 methods(obj)

 Methods for class junk:

 junk  me

How can I get both junk $ me methods after I call myFunction(Obj) method?

Answer 1

[Honglei Chen]

You need to use handle object. Use the following line in your class definition

classdef junk < handle

You can then write your function as

function myFunction(obj)
  obj.myValue = obj.myValue+1;
end

Answer 2

[Honglei Chen]

You need to instantiate the class first in myFunction. The code as is just create a struct obj in myFunction that has a field named myValue.

function obj = myFunction(obj3)
  obj = junk;
  obj.myValue = obj3.myValue + 1;
end

BTW, you may want to pay more attention to class names and variable names, make them meaningful.

[Umit]

The problem is, this is the basic version of my program, I have a complex series of methods $ functions and I need to update object's properties from another method w/o losing same object's methods. How can I do that with updating objects parameters from different functions (something different than constructor of the object).

[Honglei Chen]

I started a new answer so I can format the code

Answer 3

[Umit]

Great it works fine. Thank you.