Nice. Works perfectly. On Wed, May 27, 2009 at 2:03 PM, Henrique Dallazuanna <www...@gmail.com> wrote: > Try this: > > cbind(sort(x[,1]), unlist(tapply(x[,2], x[,1], sort, decreasing = T))) > > On Wed, May 27, 2009 at 9:39 AM, Paul Geeleher <paulgeele...@gmail.com> > wrote: >> >> I've got a matrix with 2 columns and n rows. I need to sort it first >> by the values in column 1 ascending. Then for values which are the >> same in column 1, sort by column 2 decending. For example: >> >> 2 .5 >> 1 .3 >> 1 .5 >> 3 .2 >> >> Goes to: >> >> 1 .5 >> 1 .3 >> 2 .5 >> 3 .2 >> >> This is easy to do in spreadsheet programs but I can't seem to work >> out how to do it in R and haven't been able to find a solution >> anywhere. >> >> >> Thanks! >> >> -Paul. >> >> -- >> Paul Geeleher >> School of Mathematics, Statistics and Applied Mathematics >> National University of Ireland >> Galway >> Ireland >> >> ______________________________________________ >> 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. > > > > -- > Henrique Dallazuanna > Curitiba-Paraná-Brasil > 25° 25' 40" S 49° 16' 22" O >
-- Paul Geeleher School of Mathematics, Statistics and Applied Mathematics National University of Ireland Galway Ireland ______________________________________________ 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.
