R help - Dec 2010 - Sweave problem: lines repeated

Hi all

I'm having a problem when using Sweave.  Here is a minimal example.

My input file (eg, test.Snw) looks like this:





<<TESTME,echo=FALSE,
results=hide,fig=FALSE,keep.source=TRUE>>data(cars)
m1 <- lm( dist~speed, data=cars ); coef( m1 )
@

<<echo=TRUE,results=verbatim,fig=FALSE,keep.source=TRUE>><<TESTME>>
@

<<TESTME2,echo=FALSE,
results=hide,fig=FALSE,keep.source=TRUE>>data(cars)
m1 <- lm( dist~speed, data=cars )
@

<<echo=TRUE,results=verbatim,fig=FALSE,keep.source=TRUE>><<TESTME2>>
@
 



After running Sweave over this file in R, the output file (eg. test.tex) looks
like this:



\begin{Schunk}
\begin{Sinput}
> data(cars)
> m1 <- lm( dist~speed, data=cars ); coef( m1 )
> m1 <- lm( dist~speed, data=cars ); coef( m1 )
\end{Sinput}
\begin{Soutput}
(Intercept)       speed 
 -17.579095    3.932409 
\end{Soutput}
\end{Schunk}
 

\begin{Schunk}
\begin{Sinput}
> data(cars)
> m1 <- lm( dist~speed, data=cars )
\end{Sinput}
\end{Schunk}
 



For some reason I cannot fathom, the first two chunks end up giving me *part* of
the verbatim code twice (which is not what I was expecting), but the last two
chunks do things as I expect.

Can anyone point me to my error, or explain why this happens? 

P.
> sessionInfo()
R version 2.12.0 (2010-10-15)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_AU.UTF-8/en_AU.UTF-8/C/C/en_AU.UTF-8/en_AU.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] MASS_7.3-8

loaded via a namespace (and not attached):
[1] tools_2.12.0
> version
               _                            
platform       i386-apple-darwin9.8.0       
arch           i386                         
os             darwin9.8.0                  
system         i386, darwin9.8.0            
status                                      
major          2                            
minor          12.0                         
year           2010                         
month          10                           
day            15                           
svn rev        53317                        
language       R                            
version.string R version 2.12.0 (2010-10-15)



Peter Dunn: Biostatistician (Room T4.15)
School of Health and Sport Science
Faculty of Science, Health and Education  ML-34
University of the Sunshine Coast, Locked Bag 4
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Fax: +61 7 5430 2896
Email: pdunn2 at usc.edu.au
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