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OOP subsref runs twice with "end"?

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matt dash
matt dash 2014-10-20
编辑： Matt J 2014-10-20
I have a simple object:
classdef objTest
methods
function [varargout]=subsref(obj,S)
disp(S)
varargout={[]}; %irrelevant for this test...
end
end
end
Now if I do o = objTest; o.test{1}(1:end), it displays S twice, first showing only the . and {} references, and then again showing all 3. Can anyone explain why this happens? I assume it's somehow related to a builtin function running to figure out how to evaluate the "end"?

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Matt J
Matt J 2014-10-20
编辑：Matt J 2014-10-20
I assume it's somehow related to a builtin function running to figure out how to evaluate the "end"?
Yes. The expression o.test{1}(1:end) is equivalent to
temp=o.test{1};
n=numel(temp);
o.test{1}(1:n);
So, subsref is called twice. If you had done o.test{end}(1:end), then it would have been called three times.

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