MATLAB: Cannot accèss methods of an Object after modified

classmatlab objectsmethods

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?

Best Answer

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

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MATLAB: Super class get callers name

Found it. Just call this:

 me = class(obj);

this gives the name of the created subclass. I call it in the constructor of the superclass:

 function obj = mySuperClass() %constructor
   me = class(obj);
   obj.name = me;
 end

MATLAB: Is calling a superclass constructor after a use of the object not allowed

I can only speculate as to why it would not be allowed, but I assume there are hazards in using an object that is not finished being constructed...like feeding a baby that is only half way through being born, or driving a car that’s only half assembled.

Below is how I would re-implement. In your original design, it doesn't make sense to me that the classB constructor should have to set x if it has already been set in classA.

classdef superclass
    
    %% PROPERTIES
    properties 
        x;
        y;
    end
    
end

classdef classA < superclass
    
    %% PROPERTIES
    properties
        a
    end
    
    properties (Access=private)
        z
    end
    
    %% METHODS
    methods
        % Constructor


        function obj = classA(a,z,y)
            obj.x = a*z;
            obj.a = a;
            obj.z = z;
            if nargin>2
             obj.y=y;   
            end
        end
    end
    
end

classdef classB < superclass
    
    %% PROPERTIES
    properties
        b
    end
    properties (Access=private)
        z
    end
    
    %% METHODS
    methods
        % Constructor
        function obj = classB(b,z,x)
            obj.y = z+b;
            obj.b = b;
            obj.z = z;
            if nargin>2
               obj.x=x; 
            end
        end
    end
    
end

classdef subclass < classA & classB
    
    %% METHODS
    methods
        % Constructor
        function obj = subclass(a,b,z)
            obj@classA(a,z);  %set x but not y
            obj@classB(b,z);  %set y but not x  
        end
    end
    
end

Best Answer

Related Solutions

MATLAB: Super class get callers name

MATLAB: Is calling a superclass constructor after a use of the object not allowed

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