On Feb 15, 2012, at 15:17 , R. Michael Weylandt wrote: > But that's dropping unused factor levels, not the drop of `[`
Is there a good reason that nobody has suggested looking at aggregate()? There would seem to be a little red tape to sort out, but, I mean, this is generally speaking what aggregate() is intended for. (And please choose an intelligent Subject: field next time. We now have two "question" threads mixed up, not to mention multiple other long-dead "question" threads from the last 1.5 years that get resurrected and inserted at the head of the thread.) -pd > > Michael > > On Wed, Feb 15, 2012 at 9:16 AM, David Winsemius <dwinsem...@comcast.net> > wrote: >> >> On Feb 15, 2012, at 7:19 AM, R. Michael Weylandt wrote: >> >>> Sorry about that -- forgot the case where you might only have a >>> certain entry once: try this, >>> >>> sapply(split(GS, rownames(GS)), function(x) colSums(as.matrix(x))) >>> >>> or >>> >>> sapply(split(GS, rownames(GS)), function(x) if(is.matrix(x)) colSums(x) >>> else x) >>> >>> I'm not sure if there's a way to force split to give you matrix >>> elements back but it would be nice. >> >> >> The help(split) page says there is a 'drop' parameter. That would have been >> what I tried first. >> >> -- >> >> David Winsemius, MD >> West Hartford, CT >> > > ______________________________________________ > 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. -- Peter Dalgaard, Professor Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.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.
