Selecting unique pairs from a vector

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

Answer 1

[Azzi Abdelmalek]

imax = [1;2;3;4;5;6]
out=nchoosek(imax,2)

[jlt199]

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