Creating pairs of vector elements

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N S
N S 2013-8-26
I have 3 vectors, each containing 9 elements. I want to create all the possible pairs (729) of the vector elements in a random order. What would be an efficient way to do it?
Thanks a million! N.

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-26
编辑：Azzi Abdelmalek 2013-8-26
% Example
a=randi(9,9,1);
b=randi(9,9,1);
c=randi(9,9,1);
%-----------------------------------
[ii2,jj2]=ndgrid(a,b);
[ii3,jj3]=ndgrid(1:numel(ii2),c);
v2=[a(ii2(:)) b(jj2(:))];
v3=[v2(ii3(:),:) c(jj3(:))];
n=size(v3,1);
v3=v3(randperm(n),:)
Andrei Bobrov
Andrei Bobrov 2013-8-26
a = (1:9)';
b = a;
c = a;
[ii,jj,k] = ndgrid(a,b,c);
out = [ii(:),jj(:),k(:)];

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