How to pass field values to subclass from superclass?

Question

kanuri venkata mohana 2020-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/571171-how-to-pass-field-values-to-subclass-from-superclass

回答： per isakson 2020-7-30

Hi guys,

I would like to pass my propert values of super class to subclass? I could transfer the properties but not the values of it. I am sending you the code that i made. Please tell me how could i correct it.

classdef clWinding
    properties
        Npcs
        Npcp
    end
    properties (Dependent)
        kb
    end
    methods
        function objW = clWinding (Npcs, Npcp)
            objW.Npcs = Npcs;
            objW.Npcp = Npcp;
        end
        function kb = get.kb (objW)
            kb = objW.Npcs + objW.Npcp;
        end
    end
end

This is the superclass

classdef clLitz <clWinding
    properties
        Litz
    end
    methods
        function objLitz = clLitz (Npcs, Npcp, Litz)
            objLitz @ clWindingPrimary (Npcs, Npcp);
            objLitz.Litz = Litz;
        end
    end
end    

When i did this i could pass the fields but not values of it. Can anyone tell me what mistake i have done and help me to resolve it.

Thnak you

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Steven Lord 2020-7-27

Because your objLitz isa clWinding object (through inheritance) you can ask for the values of the (for example) Npcs property it has because it is a clWinding object.

obj = clLitz(1, 2, 3) % using dummy values
N = obj.Npcs

kanuri venkata mohana 2020-7-27

Once again Thankyou for your reply. So, you mean i need to assign values manually for the superclass properties in my subclass right.

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Answer 1

per isakson 2020-7-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/571171-how-to-pass-field-values-to-subclass-from-superclass#answer_472735

There are syntax errors in your code. Try to keep the little box in the upper right corner,

, green at all time.

I've fixed your code, based on a bit of guessing, and run

>> objLitz = clLitz( -17, 17, 991 );
>> objLitz
objLitz = 
  clLitz with properties:
    Litz: 991
    Npcs: -17
    Npcp: 17
      kb: 0

where

classdef clWinding
    properties
        Npcs
        Npcp
    end
    properties (Dependent)
        kb
    end
    methods
        function objW = clWinding( Npcs, Npcp )
            objW.Npcs = Npcs;
            objW.Npcp = Npcp;
        end
        function kb = get.kb( objW )
            kb = objW.Npcs + objW.Npcp;
        end
    end
end

and

classdef clLitz < clWinding
    properties
        Litz
    end
    methods
        function objLitz = clLitz (Npcs, Npcp, Litz)
            % How to Call Superclass Constructor
            objLitz = objLitz@clWinding( Npcs, Npcp);
            objLitz.Litz = Litz;
        end
    end
end

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Answer 2

Matt J 2020-7-28

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编辑：Matt J 2020-7-28

copyprops.m

Your terminolgy is confusing, so I'm not completely sure I understand your question. "Classes" do not have property values. Only "objects" of classes have property values. If you have an object obj_super and you want to copy all of its non-Dependent property values to a different object obj_sub, then you can use the attached file,

obj_sub=copyprops(obj_super,obj_sub)