How to remove for loops from a code
4 views (last 30 days)
Show older comments
I've to remove for loops from a code to speed it up.
the code is:
function [S p] = similarityMatrix(data,candidates)
[row,col] = size(data);
S = zeros(row,col,row*col);
if nargin == 1
candidates = 1:numel(data);
end
for z = 1 : numel(candidates)
c = candidates(z);
for i = 1 : row
for j = 1 : col
if c == sub2ind(size(data),i,j);
S(i,j,z) = NaN;
else
S(i,j,z) = -dist(data(c),data(i,j));
end
end
end
end
%aggiungo le preferenze
p = nanmedian(S(:));
S(isnan(S)) = p;
is there a way to improve it?
0 Comments
Accepted Answer
Andrei Bobrov
on 22 Jan 2014
Edited: Andrei Bobrov
on 22 Jan 2014
n = numel(data);
S = -abs(bsxfun(@minus,data,reshape(data(candidates),1,1,[])));
S(candidates + (0:numel(candidates)-1)*n) = nan;
p = nanmedian(S(:));
S(isnan(S)) = p;
0 Comments
More Answers (0)
See Also
Categories
Find more on Digital Filtering in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!