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Quick way to find element by element difference betwen two vectors

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superkevin2009
superkevin2009 2016-8-2
回答： James Tursa 2016-8-2
I have two vectors, roughly of size 5000 each. Let’s call them vec1 and vec2. I would like a matrix of size 5000 x 5000 where the (i,j)th element represents the absolute difference between the ith element of vec1 and the jth element of vec2.
I've written my code as follows but it's very slow. I may need to expand the dimensionality of the problem so a quick way to do this would be much appreciated. Does anyone have a better way to do this?
mat=zeros(size(vec1,1),size(vec2,2));
for i=1:size(mat,1)
for j=1:size(mat,2)
mat(i,j)=abs(vec2(j)-vec1(i));
end
end

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James Tursa
James Tursa 2016-8-2
mat = abs(bsxfun(@minus,vec2(:).',vec1(:)));

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