Dear R People: Suppose I have the 4 numbers: 1,2,3,4. I would like to create a listing of the permutations of 4 items taken 4 at a time. Is there a built in function for that, please? Thanks in advance! R 2-3-1 for Windows or Linux Sincerely, Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: hodgess at gator.uhd.edu
not very-well hidden: permutations in (e1071) permn in (combinat) David L. Reiner Rho Trading Securities, LLC Chicago IL 60605 312-362-4963 -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Erin Hodgess Sent: Wednesday, August 02, 2006 11:57 AM To: r-help at stat.math.ethz.ch Subject: [R] listing of permutations Dear R People: Suppose I have the 4 numbers: 1,2,3,4. I would like to create a listing of the permutations of 4 items taken 4 at a time. Is there a built in function for that, please? Thanks in advance! R 2-3-1 for Windows or Linux Sincerely, Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: hodgess at gator.uhd.edu ______________________________________________ R-help at stat.math.ethz.ch 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.
Erin:
You got 2 (so far) pre-packaged functions .Here's an obscenely inefficient
but short un-prepackaged way to do it:
k<-4
z<- do.call('expand.grid',as.data.frame(matrix(rep(1:k,k),nc=k)))
results<- z[apply(z,1,function(x)length(unique(x))==k),]
It is too inefficient to make public, though.
-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Erin Hodgess
> Sent: Wednesday, August 02, 2006 9:57 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] listing of permutations
>
> Dear R People:
>
> Suppose I have the 4 numbers: 1,2,3,4.
>
> I would like to create a listing of the permutations
> of 4 items taken 4 at a time.
>
> Is there a built in function for that, please?
>
> Thanks in advance!
> R 2-3-1 for Windows or Linux
> Sincerely,
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: hodgess at gator.uhd.edu
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>