[R] how to keep keep matching column in output of merge

[Sarah Goslee]

Hi Nevil,

We really need an example here of what you're doing, since
merge() does keep the id column by default.


> x <- data.frame(id = c("a", "b", "c", "d"), x=c(1,2,3,4))
> y <- data.frame(id = c("b", "a", "d", "c"), y=c(101, 102, 103, 104))
> merge(x, y)
  id x   y
1  a 1 102
2  b 2 101
3  c 3 104
4  d 4 103

Sarah

On Tue, Jan 4, 2011 at 8:31 AM, Nevil Amos <nevil.amos at gmail.com> wrote:
> How do I keep the linking column[s] in a merge()?
>  I need to use the values again in a further merge.
>
> thanks
>
> Nevil Amos
>

-- 
Sarah Goslee
http://www.functionaldiversity.org