[R] Input encoding problem when using sweave with xetex

[Erich Studerus]

Thanks again. Putting options(encoding="") into the R code chunk before 
calling the read.xls function indeed did the trick. Now, I have one last 
question: How can I edit the LyX preference file to call R with 
options(encoding='UTF-8'). I prefer to edit the LyX preference file rather 
than the Sweave.sh file, because I want to run R with UTF-8 only when I use 
 XeTeX. By editing the LyX preference file, I assume it would be possible to 
define different R encoding setups for different converters.

Erich


On Wed, 12 May 2010 14:43:52 -0400
  Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
> On 12/05/2010 2:29 PM, Erich Studerus wrote:
>> Thank you! I edited the Sweave.sh file and it works now for reading data 
>> stored as R data files, but the read.xls function from the gdata-package 
>> does no longer work.
>>
>> options('encoding'='UTF-8')
>> require(gdata)
>> read.xls("http://www.schwerhoerigkeit.pop.ch/hoergeraete_test.xls", 
>> stringsAsFactors = F)[2,2]
>>
>> This gives NA as output and a warning that there was an invalid entry for 
>> the connection. Is there a way to use read.xls with UTF-8 encoding?
>>   
> 
> I don't know, you'd have to ask its authors.  But you can probably set 
>options(encoding="") before calling it.  (I'm assuming the read.xls() is in 
>a code chunk in your Sweave file.  I would guess that you don't need to set 
>the encoding back to UTF-8 afterwards, but you might:  it all depends on 
>when Sweave() opens its
> output file.)
> 
> Duncan Murdoch
>>
>>
>>
>>
>> On Wed, 12 May 2010 12:45:51 -0400
>>   Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
>> > On 12/05/2010 11:36 AM, Erich Studerus wrote:
>> >> Putting \usepackage[cp1252]{inputenc} into my preamble is not an 
>>option,
>> >> because XeTeX unlike LaTeX needs UTF-8 has input encoding. My goal is 
>>also
>> >> to have a LyX document that can be compiled both on Mac and Windows.
>> >>
>> >> I usually compile my Lyx-Sweave documents by one click of a button from
>> >> within Lyx. R code chunks are therefore executed by calling R from the
>> >> command line. If anybody knows how to run R with 
>>options(encoding="UTF-8")
>> >> from the command line under windows, that would be helpful.
>> >>
>> >> The command that calls R during compilation is contained in this file:
>> >> http://cran.r-project.org/contrib/extra/lyx/preferences
>> >>   
>> > 
>> > 
>> > You can do it with a little work.  If you look at the 
>>rhome/bin/Sweave.sh 
>> >file, you'll see that
>> > 
>> > R CMD Sweave file.Rnw
>> > 
>> > just executes something like
>> > 
>> > echo "library(\"utils\"); Sweave(\"file.Rnw\")" | R --no-restore --slave
>> > 
>> > What you want is to execute
>> > 
>> > echo "library(\"utils\"); options(encoding="UTF-8"); 
>>Sweave(\"file.Rnw\")" 
>> >| R --no-restore --slave
>> > 
>> > You could edit the rhome/bin/Sweave.sh file appropriately if you always 
>> >want Sweave to use UTF-8, or you could edit your Lyx preference file to 
>>put 
>> >in a line like this instead of what it had.
>> > 
>> > Duncan Murdoch
>>
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>