R, Latex, Sweave, ggplot2 - change ggplot dimensions

Question

Cuurently I am working on a R Sweave report. And I am having some difficulties with the ggplot dimensions in the sweave pdf output. My code:

\documentclass{report}

\begin{document}

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\begin{figure}[h]
 \begin{center}
<<echo=FALSE, fig=TRUE>>=
require(ggplot2)
df <- data.frame(a= c(1:10), b = c (10:1))

ggplot(data = df, aes(a, b)) + geom_line()
@
  \caption{caption}
 \end{center}
\end{figure}

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\end{document}

Now I want to control the plot width and height dimensions in the pdf output. actually I want to keep the height the same but make the width as the same as the text width.

Thanks for your time.

Answer 1

Have a look at the ggsave.latex() function from the AFLP package which is available on R-Forge

install.packages("AFLP", repos="http://R-Forge.R-project.org")

Then your Sweave file simplifies to this

\documentclass{report}

\begin{document}

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<<echo=FALSE, results = tex>>=
library(ggplot2)
ggsave.latex <- AFLP:::ggsave.latex
df <- data.frame(a= c(1:10), b = c (10:1))
p <- ggplot(data = df, aes(a, b)) + geom_line()
ggsave.latex(p, filename = "myplot.pdf", width = 2, height = 10, caption = "Your caption")
@

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\end{document}