[R] Removing not duplicated rows

[Chris82]

Hello R users,

I have a problem to delete rows in a table which are not duplicated in order
of an id number

a short example:

x <- data.frame(cbind(id=c(1,2,2,2,3,3,4,5,6,6), value=1:10))

x_new <- x[which(duplicated(x$id)),]

> x_new

   id value
3   2     3
4   2     4
6   3     6
10  6    10

The problem is that my command not only delet the id number which occur only
one time.
Also the first row with the id number (2,3 and 6 is deleted).

Thanks!

With best regards

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