Message-ID: <20080318221924.GB9708@amin>
Date: 2008-03-18T22:19:27Z
From: Hans Ekbrand
Subject: grouped colSums without for loops?
In-Reply-To: <1205838323.6332.14.camel@localhost>
On Tue, Mar 18, 2008 at 12:05:23PM +0100, Albert Greinoecker wrote:
> try:
> aggregate(d[,2:3], by=list(d$foo), FUN=sum)
Great! Now I can get a data.frame as well as a list, thanks!
--
Hans Ekbrand (http://sociologi.cjb.net) <hans at sociologi.cjb.net>
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