try this:

 combn(c(1,2,3,4), 2)

On Tue, May 11, 2010 at 2:45 PM, chen jia <chen_1002@fisher.osu.edu> wrote:

> Hi there,
>
> I am looking for a function that takes a vector as input and generates
> all pair wise combination of the elements of the input vector.
>
> For example, the input vector is c(1,2,3,4). The output vector is c(1
> and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, 3 and 4). The
> representation here is generic.
>
> I can use a for loop to do it, but it gets slow when the number of
> elements of the input vector is large.
>
> Best,
> Jia
>
> --
>                         Ohio State University - Finance
>                                   248 Fisher Hall
>                                    2100 Neil Ave.
>                              Columbus, Ohio  43210
>                             Telephone: 614-292-2830
>                       http://www.fisher.osu.edu/~chen_1002/<http://www.fisher.osu.edu/%7Echen_1002/>
>
> ______________________________________________
> 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.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

	[[alternative HTML version deleted]]

