[R] paired samples, matching rows, merge()
ggrothendieck at gmail.com
Fri Aug 20 15:37:26 CEST 2010
On Fri, Aug 20, 2010 at 9:33 AM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> On Fri, Aug 20, 2010 at 9:27 AM, Cecilia Carmo <cecilia.carmo at ua.pt> wrote:
>> It wasn't the merge command. It doesn't create the variable x3.
> How about:
> x$k3 <- with(x, unlist(tapply(k1, k1, seq_along)))
> y$k3 <- with(y, unlist(tapply(k1, k1, seq_along)))
And here is a second one in case that one overflows as well:
x$k3 <- with(x, seq_along(k1) - match(k1, k1) + 1)
y$k3 <- with(y, seq_along(k1) - match(k1, k1) + 1)
Note that this one assumes that the data frame is sorted by k1 which
in your example it is.
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