[R] Sweave encoding problem

[Duncan Murdoch]

Gerrit Voigt wrote:
> Hi Roland,
> thanks for your answere. I actually tried out a different, smaller  
> Latex-header and the sweave-process suddenly worked. So I copied parts 
> of the old header into the new one, to check what part is causing the 
> trouble. In the end I had two documents with identical content.  The new 
> document worked fine with Sweave the other still gave out the 
> error-message. If anybody has experienced that problem before, and knows 
> an answere, please let me know.
>   

This sounds like you have discovered homeopathic properties in Sweave!  
It will be serious if input files remember errors even after they have 
been removed.

But I think it's more likely that the files just look the same in your 
editor, but are actually different in some way you don't see.  Candidates:
 - the encoding:  maybe your editor is recognizing the encoding, and 
automatically displaying similar content from different input.
 - non-printing characters:  maybe your editor is skipping some.

I'd suggest doing a binary compare on the two files to see what the 
differences are.  I think you are on Windows (but I may be misreading 
the quotes below); I recommend Beyond Compare (a shareware compare 
utility).  It has a hex viewer plug-in that could show you a detailed 
comparison.  I imagine diff on Unix has something similar.

Duncan Murdoch
> Unfortunaetly I also still have an encoding problem with the new documt, 
> that ran through Sweave. If I use  "ISO-8859-15" fontencoding in my 
> editor and "latin1" for input encoding in my Latex-document everything 
> works fine. If I keep both in "utf8", as I would like it, german mutated 
> vowels (Umlaute) aren't displayed correctly.
>
> Rau, Roland schrieb:
>   
>> Hi Gerrit,
>>
>>   
>>     
>>> -----Original Message-----
>>> From: r-help-bounces at r-project.org 
>>> [mailto:r-help-bounces at r-project.org] On Behalf Of Gerrit Voigt
>>> Sent: Monday, January 19, 2009 4:48 PM
>>> To: r-help at r-project.org
>>> Subject: [R] Sweave encoding problem
>>>
>>> Hello,
>>> Sweave seems to have trouble processing german letters in R.
>>> For example, my noweb R-input looks like this.
>>> <<>>=
>>> Oberflächenfehler = c(4, 11, 6, 2, 7, 9)
>>> @
>>> If I send it through Sweave, I get the following error message.
>>>
>>> error:  chunk 1
>>> Error in parse(text = chunk) : unexpected input in "Oberflä"
>>> extra: Warning message:
>>> In readLines(f[1]) :
>>>    underfull last line in "C:\...."
>>>
>>> (my R is in german, so I needed to translate the error 
>>> message myself.)
>>>
>>> I got the impression, that this is an encoding issue of 
>>> Sweave, since  
>>> the input typed into R directly works just fine. The encoding 
>>> I use in  
>>> my noweb document is utf8.
>>>     
>>>       
>> I don't think it has something to do with German letters.
>> I saved the following text in a file 'sweavy.Snw':
>> \documentclass{article}
>>
>> \begin{document}
>> Hello World!
>>
>> <<>>=
>> 1+1
>> @ 
>>
>> <<>>=
>> Oberflächenfehler = c(4, 11, 6, 2, 7, 9)
>> @
>> \end{document}
>>
>> This is what happened in R:
>>   
>>     
>>> library(utils)
>>> Sweave("sweavy.Snw")
>>>     
>>>       
>> Writing to file sweavy.tex
>> Processing code chunks ...
>>  1 : echo term verbatim
>>  2 : echo term verbatim
>>
>> You can now run LaTeX on 'sweavy.tex'
>>   
>>     
>>> sessionInfo()
>>>     
>>>       
>> R version 2.7.0 (2008-04-22) 
>> i386-pc-mingw32 
>>
>> locale:
>> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base     
>>
>> And also the dvi looked fine after processing "latex sweavy.tex"
>> To make things sure, I did in my editor (GNU Emacs 22.1.50.1)
>> C-x RET f utf-8
>> to change 
>> set-buffer-file-coding-system to utf-8.
>> Still works fine.
>>
>> Maybe this helps you further to track down the reason for the problem?!?
>>
>> Best,
>> Roland
>>
>> ----------
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>>
>>
>>   
>>     
>
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