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code without for loop

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Sajid
Sajid 2012-12-5
Hi,
i have an index variable. Each row contains an x,y coordinate. i can loop through each x,y and set value. but i cannot achieve this without for loop. Can anyone tell me how to run this code without for loop?
for i=1:size(index,1)
mask(index(i,1),index(i,2)) = 255;
end
Thanks,
Sajid

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回答（1 个）

Matt Fig
Matt Fig 2012-12-5
idx = sub2ind(size(mask),index(:,1),index(:,2));
mask(idx) = 255;

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