How can I generate the matrix [1 1; 1 2; 1 3 ; 2 1; 2 2; 2 3; 3 1 ; 3 2 ; 3 3] without loops?

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Gil
Gil 2012-11-15
And given matrices XX and YY of sizes 3X3, how can I generate the following matrix:
[XX(1,1) YY(1,1); XX(1,2) YY(1,2);XX(1,3) YY(1,3); XX(2,1) YY(2,1); XX(2,2) YY(2,2); XX(2,3) YY(2,3); XX(3,1) YY(3,1); XX(3,2) YY(3,2); XX(3,3) YY(3,3)]
I mean of course, without writing it explicitly.
Thanks!!

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采纳的回答

C.J. Harris
C.J. Harris 2012-11-15
I have no idea what your data is, but to generate the matrix in the question try:
out = unique(nchoosek([1:3, 1:3], 2), 'rows');

更多回答（2 个）

Andreas Goser
Andreas Goser 2012-11-15
?? "Just telling me how to generate the matrix in the title would be a huge help!" ??
a=[1 1; 1 2; 1 3 ; 2 1; 2 2; 2 3; 3 1 ; 3 2 ; 3 3]
Jos (10584)
Jos (10584) 2012-11-15
COMBN!
combn(1:3,2)
ans =
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
http://www.mathworks.com/matlabcentral/fileexchange/7147

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