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

	[[alternative HTML version deleted]]

