Yes, that would be because she converted to Date on the fly in her example, and so apparently did not need this reminder. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity.
David Winsemius <dwinsem...@comcast.net> wrote: > >On Apr 14, 2013, at 11:01 PM, Katherine Gobin wrote: > >> Dear R forum, >> >> I have a data.frame as defied below - >> >> df = data.frame(names = c("C", "A", "A", "B", "C", "B", "A", "B", >"C"), dates = c("4/15/2013", "4/13/2013", "4/15/2013", "4/13/2013", >"4/13/2013", "4/15/2013", "4/14/2013", "4/14/2013","4/14/2013" ),values >= c(10, 31, 31, 17, 11, 34, 102, 47, 29)) >> >>> df >> names dates values >> 1 C 4/15/2013 10 >> 2 A 4/13/2013 31 >> 3 A 4/15/2013 31 >> 4 B 4/13/2013 17 >> 5 C 4/13/2013 11 >> 6 B >> 4/15/2013 34 >> 7 A 4/14/2013 102 >> 8 B 4/14/2013 47 >> 9 C 4/14/2013 29 >> >> I need to sort df first on "names" in increasing order and then >further on "dates" in a decreasing order i.e. I need >> > >So far no one has pointed out that these are not really "Dates" in the >R sense and will not sort correctly if any of the proposed methods are >applied to sequences that extend beyond6 months, i.e, until October >forward. You would be advised to convert to real Date-classed >variables. > >?strptime >?as.Date ______________________________________________ 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.