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Finally implemented perceptual brightness thing.
author samer
date Sun, 11 Oct 2015 10:20:42 +0100
parents e44f49929e56
children
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% submat - extract square submatrix
%
% submat :: [[N,M]], [[L]->[min(N,M)]] -> [[L,L]].
%
% submat(X,I)=X(I,I)
function B=submat(A,I), B=A(I,I); end