>   This may be asking too much, but I'm wondering if anyone has a
> solution (even a hack) for creating multiple (overlay) plots in an
> Sweave file and post-processing the overlays in beamer appropriately.


Although I have not done this with beamer and overlays before, I once
had to resort to generating the includegraphics commands from within a
loop in order to save substantial amoutns of typing. You could do
something similar along these lines (untested):


<<echo=F>>=
        slidenum <- 1
        plotbasename <- "something"
        plotfilename <- paste(plotbasename, slidenum, ".pdf", sep="")
        pdf(file=plotfilename)
        plot(stuff)
        dev.off()
        cat("\\only", slidenum, "{\includegraphics{", plotfilename ,"}}\n" 
,sep="")
@

<<echo=F>>=
        slidenum <- slidenum + 1
        plotfilename <- paste(plotbasenema, slidenum, ".pdf", sep="")
        pdf(file=plotfilename)
        plot(stuff)
        dev.off()
        cat("\\only", slidenum, "{\includegraphics{", plotfilename ,"}}\n" 
,sep="")
@

If you want toget really fancy, you could wrap most of this in a
conveniance function...

cu
        Philipp

-- 
Dr. Philipp Pagel
Lehrstuhl für Genomorientierte Bioinformatik
Technische Universität München
Wissenschaftszentrum Weihenstephan
Maximus-von-Imhof-Forum 3
85354 Freising, Germany
http://webclu.bio.wzw.tum.de/~pagel/

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