> newmat <- cbind( oldmat, order=seq(nrow(oldmat)) ) See ?seq and/or ?rev for descending.
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Assa Yeroslaviz > Sent: Thursday, June 10, 2010 7:56 AM > To: r-h...@stat.math.ethz.ch > Subject: [R] adding column of ordered numbers to matrix > > Hello everyone, > > I have a matrix of over 40000 line and about 30 columns. > > For my analysis I would like to add another column with ascending > numbers > (column header should be "order", and than 1,2,3,4 ....the end of the > matrix). > During my analysis I reorder them ( due to merge commands by a > different > column). > > How do I add such a column in an ascending order (or descending for > what it > matters)? > > THX > > Assa > > [[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.