Try this: with(DF, rowsum(quantity, identifier))
On Thu, Dec 2, 2010 at 2:24 PM, chris99 <chea...@hotmail.com> wrote: > > I am trying to aggregate data in column 2 to identifiers in col 1 > > eg.. > > take this> > > identifier quantity > 1 10 > 1 20 > 2 30 > 1 15 > 2 10 > 3 20 > > and make this> > > identifier quantity > 1 45 > 2 40 > 3 20 > > > Thanks in advance for your help! > -- > View this message in context: > http://r.789695.n4.nabble.com/Help-summarizing-R-data-frame-tp3069624p3069624.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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 [[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.
