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.
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