See ?rowsum. The other two suggestions are both shown in the Example section as well (with comment).
Andy From: Hans Ekbrand > > * PGP Signed by an unknown key: 03/18/2008 at 06:22:03 AM > On Tue, Mar 18, 2008 at 05:57:59AM -0500, jim holtman wrote: > > Is this what you want? > > > > > lapply(split(d, d$foo), function(x) colSums(x[,-1])) > > Yes! Thank you! the *apply functions seem very powerful, thanks again > for giving me a hint on how to use them. > > -- > Hans Ekbrand (http://sociologi.cjb.net) <[EMAIL PROTECTED]> > Q. What is that strange attachment in this mail? > A. My digital signature, see www.gnupg.org for info on how you could > use it to ensure that this mail is from me and has not been > altered on the way to you. > * Unknown Key > * 0x7050614E (L) > > ------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachme...{{dropped:15}} ______________________________________________ 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.
