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From: Eric He on 4 Jun 2010 11:10
Hi,

I am trying to build a class that inherits from another class, in which both classes have the ability to save objects. The superclass code is as follows:

classdef exclass
properties
value
end
methods
function obj=exclass(in)
obj.value=in;
end
function [val,obj]=myfun(obj)
[val,obj]=obj.doubler();
end
function [val,obj]=doubler(obj)
obj.value=obj.value*2;
val=obj.value;
fprintf('%d',val);
end
function S=saveobj(obj)
S.Pointvalue=obj.value;
end
function obj=reload(obj,S)
obj.value=S.Pointvalue;
end
end
methods (Static=true)
function obj=objload(S)
obj=exclass;
obj=reload(obj,S);
end
end
end

and the subclass code is as follows:

classdef myclass < exclass
properties
val
end
methods
function obj=myclass(value,val)
obj=obj(a)exclass(value);
obj.val=val;
end
function S=saveobj(obj)
S=saveobj(a)exclass(obj);
S.Pointval=obj.val;
end
function obj=reload(obj,S)
obj=reload(a)exclass(obj,S);
obj.val=S.Pointval;
end
end
methods (Static=true)
function obj=loadobj(S)
obj=myclass;
obj=reload(obj,S);
end
end
end

While I can save and load the superclass fine, when I try saving and loading the subclass, all of the parameters of the loaded object are empty sets. The error I get is:

Error occurred while trying to load object of type myclass:
Input argument "value" is undefined.

I understand that "value" is undefined, but how do I make a constructor where "value" doesn't need to be defined? Or how do I get a "value" when the myclass constructor doesn't have any inputs?

Thanks,

Eric
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Next: Extract data from cell using matrix of index points