Hi, Try: dat1 <- read.table(text="A B C 1 a 1 ff 2 b 1 re 3 c 1 sd 5 a 2 as 6 c 4 fe 7 d 5 tt 8 d 5 tt 9 d 9 oi",sep="",header=TRUE,stringsAsFactors=FALSE)
within(dat1,D<-ave(seq_along(A),A,FUN=length)) A.K. On Thursday, December 26, 2013 11:28 AM, Bartłomiej Taciak <bartek.tac...@gmail.com> wrote: Hi everyone, My data looks like this one: A B C 1 a 1 ff 2 b 1 re 3 c 1 sd 5 a 2 as 6 c 4 fe 7 d 5 tt 8 d 5 tt 9 d 9 oi I want to add a new column D, which will contain how many an element from the column A is repeated, like this: A B C D 1 a 1 ff 2 2 b 1 re 1 3 c 1 sd 2 5 a 2 as 2 6 c 4 fe 2 7 d 5 tt 3 8 d 5 tt 3 9 d 9 oi 3 I don't want to simplify my data and grouping raws like in this thread: https://stat.ethz.ch/pipermail/r-help/2011-March/270481.html Thanks in advance for any help, best regards, Bartek [[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. ______________________________________________ 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.
