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How can I make the following for loop faster without exceeding the memory limit?

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Audrey Cheong
Audrey Cheong 2017-11-27
评论： Audrey Cheong 2017-11-27
EX.
% remove these indices from faces (really long array)
pt_indices = [1 357 472 10035 ...];
faces = N x 3 matrix (extremely large matrix)
% reverse order so indices to be removed do not change
for i = length(pt_indices):-1:1
sel = faces>pt_indices(i);
faces(sel) = faces(sel) - 1; % adjust face indices
end
I tried to convert the for loop to a matrix operation but it exceeded the memory limit. Is there another way to speed this up?

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Walter Roberson
Walter Roberson 2017-11-27
[~, binnum] = histc(faces, [pt_indices, inf]);
faces = faces - binnum;

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