permutations in R
On Mar 16, 2009, at 6:43 PM, Stavros Macrakis wrote:
Greg, Thanks for helping this user. I assume you mean the permn function in the combinat package? For a new user (including me), it is not obvious how to get from "the permutations function in the Combinations package" to that. I see there is also a function gtools::permutations. The gtools package seems to be more recent than combinat, but I don't know if it is better. You might expect a utils::permn since there is a utils::combn, but there isn't one.... I'm not bringing this up because I am bloody-minded, but because I think it's a serious issue with the R libraries -- there is no obvious way to find relevant functions, and no way of knowing which one to use if there is more than one. Or am I missing some trick?
<http://search.r-project.org/cgi-bin/namazu.cgi?query=permutations&max=100&result=normal&sort=score&idxname=functions >
Thanks,
-s
On Mon, Mar 16, 2009 at 3:26 PM, Greg Snow <Greg.Snow at imail.org>
wrote:
Look at the permutations function in the Combinations package. Using the "fun" argument may accomplish what you want. If not, there are references on the help page to other code that may work for you. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org 801.408.8111
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- project.org] On Behalf Of onyourmark Sent: Friday, March 13, 2009 7:09 PM To: r-help at r-project.org Subject: [R] permutations in R Hi. Does anyone know of a function which will take as input a number n (or a set of n letters) and will give out, one at a time, the permutations of n (or of those n letters) as a vector? So that I can use the permutations one at a time. And such that it will exhaust all the permutations with no repeats. For example if n is 3, I would want a function which I could use in a loop and the first time I use it in the loop it may give the vector 123 and then the next time in the loop it may give 132 and so on until after 6 iterations through the loop I would get all 6 permutations of 123. Thank you. -- View this message in context: http://www.nabble.com/permutations-in-R- tp22507989p22507989.html Sent from the R help mailing list archive at Nabble.com.
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