That's beyond my knowledge of plyr...S
On Wednesday, May 11, 2011 at 12:31 PM, Justin wrote: 
> Scott Chamberlain <scttchamberlain4 <at> gmail.com> writes:
> 
> > 
> > How about this:
> > 
> > ddply(test.set, .(site), colwise(max))
> > On Wednesday, May 11, 2011 at 11:46 AM, Justin wrote: 
> > > test.set<-data.frame(site=1:10,x=.Random.seed[1:100],y=rnorm(100))
> > > means<-ddply(test.set,.(site),mean)
> > > means 
> > 
> >  [[alternative HTML version deleted]]
> 
> Thats the ticket! So mean is already set up to operate on columns but max and
> min are not? I guess its not too important now I know ... but whats going on in
> the background that makes that happen?
> 
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