On Thu, 2007-11-22 at 19:09 +0100, Michael Wolf wrote:
> Dear all,
>
> Is there a function that computes all binomial combinations.
> I am aware of the function "choose(n, k)" which computes the
> number of such combinations, but not the actual combinations
> themselves, e.g.:
>
> > choose(4, 2)
> [1] 6
>
> So I am looking for function that would give me the following
> matrix as output, say:
>
> > function(4, 2)
> [,1] [,2]
> [1,] 1 2
> [2,] 1 3
> [3,] 1 4
> [4,] 2 3
> [5,] 2 4
> [6,] 3 4
>
> Matlab has such function, but I could not find one in R.
>
> Please also reply directly to me: [EMAIL PROTECTED]
>
> Thanks much,
> Michael
Using:
help.search("combinations")
leads you to several possibilities.
For example:
> combn(4, 2)
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 1 1 2 2 3
[2,] 2 3 4 3 4 4
HTH,
Marc Schwartz
______________________________________________
R-help@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.
