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I have a simple question coincerning the Mathematica function Tuple.

Currently, I apply the following code

x = {1, 2, 3};
Tuples[x, 2]

Obviously I get:

enter image description here

How can I delete all self-loops from this list, i.e., delete {1, 1}, {2, 2}, {3, 3}? Is there a built-in function?

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up vote 10 down vote accepted

I think you want Permutations:

Permutations[{1, 2, 3}, {2}]

{{1, 2}, {1, 3}, {2, 1}, {2, 3}, {3, 1}, {3, 2}}

share|improve this answer
perfect. Thanks a lot – Julian Aug 27 '14 at 7:42

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