I just noticed that the question has already been answered on the R-help list before:

http://r.789695.n4.nabble.com/Sweave-font-problems-with-Signif-codes-lines-td977346.html

Adding the following R line solves the problem:

options(useFancyQuotes = FALSE)

Mark

> 
> 
> On Fri, Dec 2, 2011 at 4:08 PM, Mark Heckmann <mark.heckmann@gmx.de> wrote:
>> I have the following Sweave file which gets sweaved correctly.
>> 
>> <<>>=
>> m <- lm(y1 ~x1, anscombe)
>> summary(m)
>> @
>> 
>> I include the sweaved .tex file into another .tex file via include.
>> When I use a single umlaut in the .snw file a warning occurs.
>> As a result part of the summary output is not contained in the .tex file.
>> 
>> ä
>> <<>>=
>> m <- lm(y1 ~x1, anscombe)
>> summary(m)
>> @
>> 
>> You can now run (pdf)latex on 'ch1.tex'
>> Warnmeldungen:
>> 1: ‘ch1.Snw’ has unknown encoding: assuming Latin-1
>> 2: ungültige Zeichenkette in Konvertierung der Ausgabe (wrong character in conversion of output)
>> 
>> Interestingly, this error does NOT occur, when I omit the summary(m) statement.
>> 
>> ä
>> <<>>=
>> m <- lm(y1 ~x1, anscombe)
>> #summary(m)
>> @
>> 
>> You can now run (pdf)latex on 'ch1.tex'
>> Warnmeldung:
>> ‘ch1.Snw’ has unknown encoding: assuming Latin-1
>> 
>> I know that I can prevent this by adding a line at the beginning of the .snw file:
>> 
>> \usepackage[utf8]{inputenc}
>> 
>> ä
>> <<>>=
>> m <- lm(y1 ~x1, anscombe)
>> summary(m)
>> @
>> 
>> This gets sweaved correctly without warnings:
>> 
>> But this solution is not good as it is not the preamble of the .tex document where I add the usepackage line.
>> This will cause an error when processing the entire document with tex.
>> 
>> How can I achieve the last result in another way?
>> I tried:
>> 
>> Sweave('/Users/markheckmann/Desktop/test_sweave/ch1.Snw', encoding="UFT-8")
>> 
>> But this does not work either when the usepackage line is omitted.
>> 
>> I am stuck here. Can anyone help?
>> 
>> TIA
>> Mark
>> 
>> 
>> ––––––––––––––––––––––––––––––––––––
>> Mark Heckmann
>> Blog: www.markheckmann.de
>> R-Blog: http://ryouready.wordpress.com
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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>> 
>> 
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>> 

––––––––––––––––––––––––––––––––––––
Mark Heckmann
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com











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