vectorization - Matlab: speed up large for loop - Stack Overflow

Matlab: speed up large for loop up vote 5 down vote favorite 1 I'm trying to get 3 by 3 masks from a large matrix into vectors. Currently, this is my code: A=rand(3264,2448) [rows cols]=size(A); T=zeros(9,prod(size(A)-2)); for i=1:rows-2 for j=1:cols-2 T(

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