[R] permutations in R

[Greg Snow]

No, I meant the Combinations package, it is apparently an Omegahat package (http://www.omegahat.org/Combinations/).  It looks similar to the permn function as far as the usage goes, but the documentation includes additional information on other resources.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: macrakis at gmail.com [mailto:macrakis at gmail.com] On Behalf Of
> Stavros Macrakis
> Sent: Monday, March 16, 2009 4:43 PM
> To: Greg Snow
> Cc: onyourmark; r-help at r-project.org
> Subject: Re: [R] permutations in R
> 
> 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?
> 
> 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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> >> PLEASE do read the posting guide http://www.R-project.org/posting-
> >> guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >
> > ______________________________________________
> > R-help at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >