OOP subsref runs twice with "end"?

3 views (last 30 days)
matt dash
matt dash on 20 Oct 2014
Edited: Matt J on 20 Oct 2014
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"?

Accepted Answer

Matt J
Matt J on 20 Oct 2014
Edited: Matt J on 20 Oct 2014
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.

More Answers (0)

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!