very slick Thx. On Fri, Jul 30, 2010 at 12:44 PM, Wu Gong <w...@mtmail.mtsu.edu> wrote:
> > Hi, > > R has a buildin function ?rowsum > > rowsum(DF$Data,DF$Id,na.rm=T) > > ----- > A R learner. > -- > View this message in context: > http://r.789695.n4.nabble.com/Summing-by-index-tp2308332p2308411.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. > [[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.
