How can I vectorize these for loops?
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Budhvin Jayasinghe
le 28 Mai 2020
Commenté : Budhvin Jayasinghe
le 28 Mai 2020
Newbie here. I was wondering if there was a way to vectorize these for loops, or simply to change it to make it faster? Any help would be appreciated. Thank you!
m = zeros(50);
d = zeros(50);
for i = 1:size(m,1)
for n = 1:size(m,2)
try d(i,n) = sum(m(i-1:i+1,n-1:2:n+1),'all') + sum(m(i-1:2:i+1,n),'all');
catch, continue
end
end
end
What it does is scan the matrix positions immediately surrounding each matrix position being looped through and sums the values. It doesn't work at the edges or the corners, which is what the try, catch statement is for. Thanks again.
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Réponse acceptée
Mohammad Sami
le 28 Mai 2020
What you are trying to do is 2D convolution. There is a function conv2 that will allow you to do this.
m = ones(50);
filter = ones(3);
filter(2,2) = 0;
% 3x3 filter with excluding the center.
d = conv2(m,filter,'same');
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