I have a A ,15*15 matrice with random numbers , i wanna just get the values outside A (5:8 ,5:8) ,I mean A-A(5:8,5:8)?? i know subtract is not possible , becuase dimension is not same , how can i do this?

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Akshit 2015-3-10

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Answer 1

Image Analyst 2015-3-10

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Try this:

A = randi(9, [15,15]); % Initial data
% Set middle rectangle to nans
A(5:8,5:8) = nan
% Extract numbers not in the NAN rectangle
output = A(~isnan(A))