pgfSweave() results in texi2dvi error “Missing \endcsname inserted”

Question

When running pgfSweave using a file with the following sample code:

\documentclass[letter]{article}
\begin{document} 
In this example we embed parts of the examples from the
\texttt{kruskal.test} help page into a \LaTeX{} document :
<<>>=
data(airquality)
kruskal.test(Ozone ~ Month, data = airquality)
@
\end{document}

and this command:

pgfSweave("sweave.Snw")

the following error occurs:

...(latex header)....
("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\infwarerr.sty")
("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\ltxcmds.sty")))
! Missing \endcsname inserted.
<to be read again> 
...(latex crashing out)...

This file works fine with this command:

Sweave("sweave.Snw")

and then "latex sweave.tex" at the command line.

Answer 1

I found the answer here:

On Thu, Feb 11, 2010 at 6:36 PM, Yihui Xie wrote: If I understand pgfSweave correctly, a line like this

\usepackage{C:/PROGRA~1/R/some.version/share/texmf/Sweave}

will be added to the preamble of your LaTeX document if you didn't explicitly add \usepackage{Sweave} by yourself.

That will cause the error like

Missing \endcsname inserted

When I add \usepackage{Sweave} to the above file it works fine.