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Re: st: combinatorics

From   James Muller <>
Subject   Re: st: combinatorics
Date   Wed, 17 Aug 2005 22:24:58 +1000

Mata sounds good (I wonder how it compares to an optimized C-based plugin). The algorithm is loop-based, so compilation really helps for anything big. Would be nice to be able to do permutations 20 choose 5 and get something back before the release of Stata 10.

Any more thoughts?


Roger Newson wrote:

At 04:23 17/08/2005, James wrote:

Does anybody know of a package that generates permutations and combinations? That is, the actual ordered/unordered sets of combinations or permutations of elements from a set.

I wrote a little package that does this for the set {1,2,...,n} a few months ago, and just want to check that there isn't already something equivalent out there.

Also, does anybody have a wishlist of combinatoric operations that they would like to see in Stata, other than for the generation of the above sequences?

If I type

findit permut

then I find a lot about permutation tests, but nothing that looks like a package to generate a full set of permutations or combinations.

James should probably send his package to SSC. I don't know if James is using Mata in this project, but it is probably a good idea.

Best wishes


Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
Division of Asthma, Allergy and Lung Biology
King's College London

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United Kingdom

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Opinions expressed are those of the author, not the institution.

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