R help - Mar 2012 - Function for Generating all Permutations with Repetition

Dear all,

I am looking for a function in R which returns all possible permutations of an
object x with r number of repitions. For example

If x <- c(0,1) and r <-3 the result should be

0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1 
1 1 0
1 1 1

and consist of 2^3=8 elements.
Unfortunately, I have found only functions which return the combinations for
"choose n over k" but not the case described above.
I would appreciate hints and help highly.

Best,

Martin

--

Have a look at expand.grid(), e.g.,

expand.grid(rep(list(0:1), 3))


I hope it helps.

Best,
Dimitris


On 3/5/2012 9:46 AM, Martin Spindler wrote:
> Dear all,
>
> I am looking for a function in R which returns all possible permutations of
an object x with r number of repitions. For example
>
> If x<- c(0,1) and r<-3 the result should be
>
> 0 0 0
> 0 0 1
> 0 1 0
> 0 1 1
> 1 0 0
> 1 0 1
> 1 1 0
> 1 1 1
>
> and consist of 2^3=8 elements.
> Unfortunately, I have found only functions which return the combinations
for "choose n over k" but not the case described above.
> I would appreciate hints and help highly.
>
> Best,
>
> Martin
>
> --
>
> ______________________________________________
> 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.
>
-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/