Hi Your question was formated in HTML and therefore came scrammbled. Post in plain text. And preferably use dput for posting data.
Regards Petr > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Norbi Gurracho > Sent: Thursday, January 02, 2014 12:33 PM > To: r-help@r-project.org > Subject: [R] Create a unique group id > > I have a following sample data frame. How can I create a group id of > column and b and to obtain column c? a b c 1 1 1 1 > 1 > 1 1 1 1 1 2 2 1 2 2 1 2 2 1 > 3 3 1 > 3 3 1 3 3 2 1 4 2 1 4 2 1 > 4 2 2 > 5 2 2 5 2 2 5 2 2 5 > [[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.
