Removing rows in dataframe w'o duplicated values
Hi:
Here's one way:
do.call(rbind, lapply(L, function(d) if(nrow(d) > 1) return(d)))
id value value2
1.1 1 5 1
1.2 1 6 4
1.3 1 7 3
3.5 3 5 4
3.6 3 4 3
HTH,
Dennis
On Tue, Nov 22, 2011 at 9:43 AM, AC Del Re <delre at wisc.edu> wrote:
Hi,
Is there an easy way to remove dataframe rows without duplicated values of
a specified column ('id')? ?e.g.,
dat <- data.frame(id = c(1,1,1,2,3,3), value = c(5,6,7,4,5,4), value2 =
c(1,4,3,3,4,3))
dat
?id value value2
1 ?1 ? ? 5 ? ? ?1
2 ?1 ? ? 6 ? ? ?4
3 ?1 ? ? 7 ? ? ?3
4 ?2 ? ? 4 ? ? ?3
5 ?3 ? ? 5 ? ? ?4
6 ?3 ? ? 4 ? ? ?3
This is sample data and the real data has hundreds of rows. In this
case, only row 4 does not have a duplicated id and I would like to
remove it without using:
dat$id[4] <- NULL
Any help is appreciated!
AC
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