With the kind help of Duncan Murdoch, I finally managed to correctly compile
LyX-Sweave documents with XeTeX under Windows. In case someone else is
struggling with a similar problem in the future, here is a small summary of
what worked for me. I assume that you have already set up Lyx to work with
Sweave and XeTeX according to the following instructions:
http://cran.r-project.org/contrib/extra/lyx/INSTALL
http://wiki.lyx.org/LyX/XeTeX
My original problem was that accented letters that were read from
Excel-files or other external sources from within R during the LyX-Sweave
document compilation were not correctly encoded in UTF-8. However, UTF-8 is
needed for typsetting the final document with XeTeX.
Because R code chunks contained in the Lyx-Sweave document were executed by
running R from the command line, it was necessary to start R with UTF-8
encoding from the command line. I managed to do this by editing the
Sweave.sh file which can be found in rhome/bin/ directory. Within sweave.sh,
I changed the command
echo "library(\"utils\"); Sweave(\"file.Rnw\")" | R --no-restore --slave
into
echo "library(\"utils\"); options(encoding=\"UTF-8\"); Sweave(\"file.Rnw\")"
| R --no-restore --slave
Because I wanted to run R with UTF-8 encoding only when I compile my
documents with XeTeX and not with LaTeX, I saved the Sweave.sh file with the
new name UTF8Sweave.sh in the same directory and changed the definition for
the conversion of Lyx-Sweave documents to PDF (xelatex). I did this by
defining a new file format in LyX under
Tools->Preferences->File handling->File formats. The file format that I
defined had the same settings as LaTeX (pdflatex), but I saved it with the
new name LaTeX (pdflatexUTF8). I then defined a new converter under
Tools->Preferences->File handling->File formats with the following settings:
From format: Sweave
To format: LaTex (pdflatexUTF8)
Converter: R CMD /path/to/UTF8Sweave.sh $$i
Because the full path to UTF8Sweave.sh file contained blanks, I had to use
the 8.3 filename which I determined by using the MSDOS cmd window. See this
post for more information:
http://article.gmane.org/gmane.comp.lang.r.general/190040
Finally, I changed the converter LaTeX (pdflatex) -> PDF(xelatex) which I
had already defined for the original LyX-XeTeX installation(see
http://wiki.lyx.org/LyX/XeTeX) to LaTeX (pdflatexUTF8) -> PDF(xelatex).
I hope this helps.
Regards,
Erich
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