R help - Dec 2007 - Rd files with unknown encoding?

How can I identify the problem generating a warning in R CMD check 
for "Rd files with unknown encoding"? 

      Google identified an email from John Fox with a reply from Brian 
Ripley about this last 12 Jun 2007.  This suggests that I may have 
accidentally entered some possibly non-printing character into the 
offending Rd file.  The message tells me which file, but I don't know 
which lines in the file.  Is there some way of finding the offending 
character(s) without laboriously running R CMD check after deleting 
different portions of the file until I isolate the problem? 

      Thanks,
      Spencer Graves

On Wed, 12 Dec 2007, Spencer Graves wrote:
>
>      How can I identify the problem generating a warning in R CMD check
> for "Rd files with unknown encoding"?
>
>      Google identified an email from John Fox with a reply from Brian
> Ripley about this last 12 Jun 2007.
But not on this list:

https://stat.ethz.ch/pipermail/r-devel/2007-June/046055.html

R-devel would have been more appropriate for this too.
>  This suggests that I may have accidentally entered some possibly 
> non-printing character into the offending Rd file.  The message tells me 
> which file, but I don't know which lines in the file.  Is there some
way
> of finding the offending character(s) without laboriously running R CMD 
> check after deleting different portions of the file until I isolate the 
> problem?
I did say so in that thread:

https://stat.ethz.ch/pipermail/r-devel/2007-June/046061.html

You can do much the same in R via iconv("", "C",
sub="byte"), provided you
can read the file in (it may not be representable in your current 
locale, but you could run R in a Latin-1 locale, if your OS has one).

-- 
Brian D. Ripley,                  ripley at 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