Awesome! Thanks:)
On Tue, May 25, 2010 at 9:40 PM, Erik Iverson <er...@ccbr.umn.edu> wrote: > Robin Jeffries wrote: > >> Hallo! >> >> I have a vector of ID's like so, >> id <- c(1,2,2,3,3,3,4,5,5) >> >> I would like to create a [start,stop] pair of vectors that index the first >> and last observation per ID. >> >> For the ID list above, it would look like >> 1 1 >> 2 3 >> 4 6 >> 7 7 >> 8 9 >> >> > which(!duplicated(id)) > [1] 1 2 4 7 8 > > cumsum(rle(id)$lengths) > [1] 1 3 6 7 9 > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.