# [R] Combinations with two part column

Gabor Grothendieck ggrothendieck at gmail.com
Tue May 17 22:53:14 CEST 2005

```Try write.table:

write.table(comb8.5[,1:5], sep = ",", row.names = FALSE, col.names = FALSE)
write.table(comb8.5[,6:8], sep = ",", row.names = FALSE, col.names = FALSE)

On 5/17/05, Sofyan Iyan <sofyan.iyan at gmail.com> wrote:
> Thanks for you quick answer.
> Could I extend my question?
> How to make the result for each rows with comma ",";
> > library(gtools)
> > comb8.5 <- t(apply(combinations(8,5), 1, function(x) c(x,setdiff(1:8, x))))
> > comb8.5[,1:5]
>      [,1] [,2] [,3] [,4] [,5]
> [1,]    1    2    3    4    5
> [2,]    1    2    3    4    6
> [3,]    1    2    3    4    7
> [4,]    1    2    3    4    8
> [5,]    1    2    3    5    6
> [6,]    1    2    3    5    7
> ...
>
> I mean like:
>    1,    2,    3,    4,    5
>    1,    2,    3,    4,    6
>    1,    2,    3,    4,    7
>    1,    2,    3,    4,    8
>    1,    2,    3,    5,    6
>    1,    2,    3,    5,    7
>
> > comb8.5[,6:8]
>      [,1] [,2] [,3]
> [1,]    6    7    8
> [2,]    5    7    8
> [3,]    5    6    8
> [4,]    5    6    7
> [5,]    4    7    8
> [6,]    4    6    8
> ...
>
> this below like:
>     6,    7,    8
>     5,    7,    8
>     5,    6,    8
>     5,    6,    7
>     4,    7,    8
>     4,    6,    8
>
> Best,
> Sofyan
>
>
> On 5/17/05, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> > On 5/17/05, Sofyan Iyan <sofyan.iyan at gmail.com> wrote:
> > > Dear R-helpers,
> > > I am a beginner using R.
> > > This is the first question in this list.
> > > My question, Is there possible to make combinations with two part column?
> > > If I have a number 1,2,3,4,5,6,7,8. I need the result something like below:
> > >
> > > 1,2,3,4,5     6,7,8
> > > 1,2,3,4,7     5,6,8
> > > 2,3,4,5,6     1,7,8
> > > 1,2,3,6,7     4,5,8
> > > 1,2,3,4,8     5,6,7
> > > 3,4,6,7,8     1,2,5
> > > ....
> > >
> >
> > Try this:
> >
> > library(gtools)
> > t(apply(combinations(8,5), 1, function(x) c(x,setdiff(1:8, x))))
> >
>
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