calling method (and sum'ing answer) on every class instance in a matrix

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tombola
tombola 2011-11-30
Hi, I asked a very similar question to this this morning for getting the sum of class properties in a matrix (cheers Daniel for the answer) but now I need to get the sum of method return values.
If I make a simple class;
MATLAB code
classdef ExampleClass < handle
methods
function obj = GetTotal(this)
%In real life this is a calculation that returns a value.
obj = 5;
end
end
end
And I make a collection of them;
MATLAB code
myCollection=[ExampleClass1; ExampleClass2; ExampleClass3; ExampleClass4];
Is there an easy way to get the sum of the GetTotal methods please? ie,
MATLAB code
sum([myCollection.GetTotal])
...would give 20?
Is it possible without making the method a dependent property?
Thanks for any help,
Tom.

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采纳的回答

David Young
David Young 2011-11-30
sum(arrayfun(@(x) GetTotal(x), myCollection))

更多回答（1 个）

Daniel Shub
Daniel Shub 2011-11-30
Welcome to the joys of MATLAB OOP. While TMW will tell you that the array nature of the OOP system is a real plus, I find it a real pain to work with. Your options are to either limit your class to scalars (i.e., not allowing myCollection) or to write your own subsref. Something like:
function varargout = subsref(obj, S)
for ii = 1:numel(obj)
varargout{ii} = builtin('subsref', obj(ii), S);
end
end
is a reasonable starting point, but it quickly gets more complicated.

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