Apologies, it is there!
On 5/01/2011 1:26 AM, Sarah Goslee wrote:
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", NA), x=c(1,2,3,4))
y<- data.frame(id1 = c(NA, "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.a...@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
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