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Selecting unique pairs from a vector

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jlt199
jlt199 on 9 Sep 2016
Commented: jlt199 on 9 Sep 2016
Afternoon all,
Suppose I have a vector
imax = [1;2;3;4;5;6];
I would like to find every set of pairs available in that matrix, so that
pairs = [1,2; 1,3; 1,4; 1,5; 1,6; 2,3; 2,4; 2,5; 2,6; 3,4; 3,5; 3,6; 4,5; 4,6; 5,6];
Where if we have the pair 1,2 we don't also have the pair 2,1. I have got this far, but it's obviously not working. Can anyone help me over the last little hurdle?
% Find every pairwise combination of indexes
[p,q] = meshgrid(imax, imax);
pairs = [p(:) q(:)];
pairs(pairs(:,1)==pairs(:,2),:) = [];
Many thanks

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 9 Sep 2016
Edited: Azzi Abdelmalek on 9 Sep 2016
imax = [1;2;3;4;5;6]
out=nchoosek(imax,2)

  1 Comment

jlt199
jlt199 on 9 Sep 2016
That's a lot simpler than my answer:
[p,q] = meshgrid(imax, imax);
pairs = [p(:) q(:)];
pairs(pairs(:,1)>=pairs(:,2),:) = [];
Thank you very much

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