[Numpy-discussion] Extracting all the possible combinations of a grid

Charles R Harris charlesr.harris@gmail....
Fri Sep 21 14:52:31 CDT 2007

On 9/21/07, Gael Varoquaux <gael.varoquaux@normalesup.org> wrote:
> Hi all,
> I want to generate all the possible triplets of integers in [0, n]. I am
> wondering want the best possible way to do this is.
> To make things clearer, I could generate i, j, k using indices:
> i, j, k = indices((n, n, n))
> But I will have several times the same triplet with different ordenings.
> I am looking for a loop-free way of creating three arrays i, j, k with
> all the triplets present once, and only once.
> Any hint appreciated.

Go here, http://www.cs.utsa.edu/~wagner/knuth/. I think you want fascicle
4A, http://www.cs.utsa.edu/~wagner/knuth/fasc4a.pdf. Some of the fascicles
from Vol 4 of TAOCP are now in print, http://tinyurl.com/2goxpr.

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