Re: [R] Contional

to me. HTH Peter Alspach > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Michael Pearmain > Sent: Wednesday, 24 September 2008 8:44 a.m. > To: r-help@r-project.org > Subject: [R] Contional > > Hi All, > > I'm

Re: [R] Contional

Is this what you want: TRUE marks the ones to be removed > mark <- (head(x$timestamp, -1) == tail(x$timestamp, -1)) & + (head(x$user_id, -1) == tail(x$user_id, -1)) > x$flag <- c(FALSE, mark) > x Source_type timestamp user_id flag 75381 0 07-07-2008-21:03:55 84

[R] Contional

Hi All, I'm having trouble selecting rows to delete, that i can't seem to overcome. Below is some sample data, i am trying to dedup the data based on each user, and simultaneously the timestamp (at the side i have highlighted expected row to be removed) I've looked at the lag function but can't