Dear Jeff, Here is a suggestion using tapply:
data.frame(last = with(x, tapply(Value, Name, function(x) x[length(x)]))) See ?tapply for more information. HTH, Jorge On Mon, Nov 16, 2009 at 2:42 PM, Hao Cen <> wrote: > Hi, > > I would like to extract the last row of each group in a data frame. > > The data frame is as follows > > Name Value > A 1 > A 2 > A 3 > B 4 > B 8 > C 2 > D 3 > > I would like to get a data frame as > Name Value > A 3 > B 8 > C 2 > D 3 > > Thank you for your suggestions in advance > > Jeff > > ______________________________________________ > 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.
