?ave > x V1 V2 1 A 1 2 A 1 3 A 2 4 B 2 5 C 0 > x$len <- ave(seq_along(x$V1), x$V1, x$V2, FUN=length) > x V1 V2 len 1 A 1 2 2 A 1 2 3 A 2 1 4 B 2 1 5 C 0 1 >
On Dec 9, 2007 1:35 AM, christopher snow <[EMAIL PROTECTED]> wrote: > I have a table with two columns: > > A 1 > A 1 > A 2 > B 2 > C 0 > > I would like to produce a third column that contains the counts of each > unique combination of col1 and col2: > > A 1 2 > A 1 2 > A 2 1 > B 2 1 > C 0 1 > > How can I do this in R? > > Thanks in advance ... > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.