How would I go by doing that? I have tried with:

source("file.R", encoding="it_IT.UTF-8")

But I get

Error in file(file, "r", encoding = encoding) : 
  unsupported conversion from 'it_IT.UTF-8' to ''

Thanks,
Luca

PS:  "it_IT.UTF-8" is what I get under locale when I run sessionInfo() 

Il giorno 03/gen/2011, alle ore 09.48, Prof Brian Ripley ha scritto:

> On Mon, 3 Jan 2011, peter dalgaard wrote:
> 
>> 
>> On Jan 3, 2011, at 08:32 , Luca Meyer wrote:
>> 
>>> Being italians when writing comments/instructions we use accented letters - 
>>> like à, ò, è, etc.... when running R scripts using such characters I get 
>>> and error saying:
>>> 
>>> invalid multibyte character in parser
>>> 
>>> I have been looking at the help and searched the r-help archives but I 
>>> haven't find anything that I could intelligibly apply to my case.
>>> 
>>> Can anyone suggest a fix for this error?
>> 
>> The most likely cause is that your scripts are written in an "8 bit ASCII" 
>> encoding (Latin-1 or -9, most likely), while R is running in a UTF8 locale. 
>> If that is the cause, the fix is to standardize things to use the same 
>> locale. You can convert the encoding of your source file using the iconv 
>> utility (in a Terminal window).
> 
> Or use the 'encoding' argument of source() to tell R what the encoding is, 
> e.g. encoding="latin1" or "latin-9" (the inconsistency being in the iconv 
> used on Macs, not in R).
> 
>> 
>> -pd
>> 
>>> 
>>> Thanks,
>>> Luca
>>> 
>>> Mr. Luca Meyer
>>> www.lucameyer.com
>>> IBM SPSS Statistics release 19.0.0
>>> R version 2.12.1 (2010-12-16)
>>> Mac OS X 10.6.5 (10H574) - kernel Darwin 10.5.0
>>> 
>>> ______________________________________________
>>> R-help@r-project.org mailing list
>>> 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.
>> 
>> -- 
>> Peter Dalgaard
>> Center for Statistics, Copenhagen Business School
>> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
>> Phone: (+45)38153501
>> Email: pd....@cbs.dk  Priv: pda...@gmail.com
>> 
>> ______________________________________________
>> R-help@r-project.org mailing list
>> 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.
>> 
> 
> -- 
> Brian D. Ripley,                  rip...@stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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