How to get Dependent Property depending on properties of objects of different class

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J. Hu
J. Hu 2013-10-2
评论： Matt J 2013-10-2
See the code below:
Ex_ObjA.m-->
classdef Ex_ObjA
properties
a
end
methods
function Obj=Ex_ObjA(t)
Obj.a = t;
end
end
end
Ex_ObjBC.m-->
classdef Ex_ObjBC
properties
b
end
properties (Dependent = true, SetAccess = public)
c
end
methods
function Obj=Ex_ObjBC(t)
Obj.b = t;
end
function c=get.c(Obj,s1) % error: Get methods must have exactly one input
c = Obj.b + s1.a;
end
end
end
I tried to do following:
s1 = Ex_ObjA(2);
s2 = Ex_ObjBC(3);
s2.c
Not successful, because "Get methods must have exactly one input". So I can pass the s1.a to Ex_ObjBC to get s1.c?
Much appreciation!!!

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Matt J
Matt J 2013-10-2
编辑：Matt J 2013-10-2
There's no apparent reason why c should be a property, Dependent or otherwise. You could just write the class this way,
classdef Ex_ObjBC
properties
b
end
methods
function Obj=Ex_ObjBC(t)
Obj.b = t;
end
function out=c(Obj,s1)
out = Obj.b + s1.a;
end
end
end
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J. Hu
J. Hu 2013-10-2
Thanks for your explanation. Since c is a value depending on properties of different classes, what you would suggest placing the function to get c - in one of the classes of the properties it depends on or none of them? For example, if c depends on 10 properties, 9 of those belong to one class A and one comes from another class B. So c is HIGHLY depending on the class A - and that is the reason I wanted to put it is a dependent property of class A.
Upon your suggestion, I did define the function like c=getc(Obj,s1) and call it using s2.getc(s1). It works but I do not understand why the inputs have to be like that, one is (Obj,s1) in the function definition and the caller is getc(s1) - not the same. I know it works but why? Seems Obj is internal input of s2. Thanks...

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