On Sat, Apr 23, 2011 at 7:06 PM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote: > On 11-04-23 2:00 PM, David Neu wrote: >> >> Hi, >> >> The rows of a data frame can be sorted lexicographically as shown in >> this example, >> >> my.df<- data.frame(x=c(1,1,1,2,2), y=c(1,2,3,2,1)) >> my.df[order(my.df$x,my.df$y, decreasing=TRUE), ] >> >> however, I'm wondering if it's possible to pass a variable in as the >> first argument to order() so that the actual set of columns used in >> the sort can be easily varied? > > Use do.call() to construct the call. > > Duncan Murdoch > >> >> FWIW, the first argument to order() is of type "..." and page 2 of R >> Language Manual says that "Users cannot easily get hold of objects of" >> this type. >> >> Many thanks for any ideas! >> >> Cheers, >> Dave >> >> ______________________________________________ >> 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. > >
Thanks! ______________________________________________ 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.
