R help - Nov 2013 - Lattice: how to change the canvas size with Sweave

Dear all,
I would like to include a wide graph with narrow height in my LaTeX 
output. Up to now I only get it done using Stangle and including
   pdf("pietje-001.pdf",width=7,height=4)
   xyplot(...)
   dev.off()
What is the correct way of setting the canvas size?
Thanks.
Gerrit Draisma

==========pietje.tex
\documentclass{article}
\title{How to define the size of the plotting canvas?}
\author{Gerrit Draisma}
\begin{document}
\maketitle
I would like to make this a wide graph with a small height.
How do I do that?
<<>>library(lattice)
@
\raggedbottom
\begin{figure}[!h]
\centering
<<echo=FALSE,fig=TRUE>>xyplot(runif(11)~(0:10),type="l",
aspect=0.4,
scales=list(x=list(tick.number=11),y=list(tick.number=3)))
@
\caption{The canvas is too big!}
\end{figure}
\end{document}
==========

Oops,

I forget to write the I included the lines pdf()..(dev.off()
in the file pietje.R generated by Stangle.
And now I see that included pietje.tex in reality was named pietje.rnw
with pietje.tex the result from Sweave.

Apologies for this confusion
Gerrit.


op 11/17/2013 12:43 PM Gerrit Draisma schreef:
> Dear all,
> I would like to include a wide graph with narrow height in my LaTeX
> output. Up to now I only get it done using Stangle and including
>    pdf("pietje-001.pdf",width=7,height=4)
>    xyplot(...)
>    dev.off()
> What is the correct way of setting the canvas size?
> Thanks.
> Gerrit Draisma
>
> ==========pietje.tex
> \documentclass{article}
> \title{How to define the size of the plotting canvas?}
> \author{Gerrit Draisma}
> \begin{document}
> \maketitle
> I would like to make this a wide graph with a small height.
> How do I do that?
> <<>>> library(lattice)
> @
> \raggedbottom
> \begin{figure}[!h]
> \centering
> <<echo=FALSE,fig=TRUE>>>
xyplot(runif(11)~(0:10),type="l", aspect=0.4,
> scales=list(x=list(tick.number=11),y=list(tick.number=3)))
> @
> \caption{The canvas is too big!}
> \end{figure}
> \end{document}
> ==========