Hi Luana, Try this:
ID <- 1:20 grade <- c(4, 4, 4, 5, 5, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10) d <- data.frame(ID, grade) d$Sequence <- do.call(c, sapply(rle(grade)$lengths, seq)) d HTH, Jorge On Wed, Dec 1, 2010 at 11:08 AM, Luana Marotta <> wrote: > Hello fellows, > > I would like to create a sequence for repeated numbers in a dataset. For > example: > > ID <- c(1:20) > grade <- c(4,4,4,5,5,7,7,7,7,8,8,8,9,9,9,9,9,10,10,10) > > Data: > > ID Grade > 1 4 > 2 4 > 3 4 > 4 5 > 5 5 > 6 7 > 7 7 > 8 7 > 9 7 > (...) > > I would like to create a variable "sequence": > > Data: > ID Grade Sequence: > 1 4 1 > 2 4 2 > 3 4 3 > 4 5 1 > 5 5 2 > 6 7 1 > 7 7 2 > 8 7 3 > 9 7 4 > > Any help is very much appreciate! > > Thank you, > > Luana Marotta > > [[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. > [[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.
