R help - Jun 2009 - Setting default plot size in Sweave

Dear Colleagues:

I have used

\SweaveOpts{prefix.string=plot, eps = FALSE, pdf = TRUE}
\SweaveOpts{width=5, height=4}

<<fig=T>>plot(...)
@

But the figure still has a width of 80% of the text width, the default 
set up by Sweave, which issues a LateX command in Sweave.sty of 
\setkeys{Gin}{.8\textwidth}.  Sweave.sty has a command 
\ifthenelse{\boolean{Sweave at gin}}{\setkeys{Gin}{width=0.8\textwidth}}{}% 
but I don't know how to set some parameter 'gin' to prevent the
setkeys
from being executed.

I would like to be able to set the default graph dimensions at the start 
of the document and to only specify height and width inside <<>>=
when I
want to depart from that default.

Thanks for any assistance.

Frank
-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

On Jun 25, 2009, at 4:47 PM, Frank E Harrell Jr wrote:
> Dear Colleagues:
>
> I have used
>
> \SweaveOpts{prefix.string=plot, eps = FALSE, pdf = TRUE}
> \SweaveOpts{width=5, height=4}
>
> <<fig=T>>> plot(...)
> @
>
> But the figure still has a width of 80% of the text width, the  
> default set up by Sweave, which issues a LateX command in Sweave.sty  
> of \setkeys{Gin}{.8\textwidth}.  Sweave.sty has a command  
> \ifthenelse{\boolean{Sweave at gin}}{\setkeys{Gin}{width=0.8\textwidth}} 
> {}% but I don't know how to set some parameter 'gin' to prevent
the
> setkeys from being executed.
>
> I would like to be able to set the default graph dimensions at the  
> start of the document and to only specify height and width inside  
> <<>>= when I want to depart from that default.
>
> Thanks for any assistance.
>
> Frank
Frank,

See section 4.1.2 of the Sweave manual on page 14:

   http://www.statistik.lmu.de/~leisch/Sweave/Sweave-manual.pdf


You can use the following *after* the \begin{document} directive:

   \setkeys{Gin}{width=0.8\textwidth}

The above is the default. Reset it to what you would like.

Note, as per that manual page, that the Sweave options 'height' and  
'width' affect the size of the PDF and EPS files created, but it is  
the above command that controls the size of the image in the document  
itself.

HTH,

Marc