[R] as.numeric(".1") + SessionInfo

[Prof Brian Ripley]

I can reproduce this via

> Sys.setlocale("LC_NUMERIC", "fr_FR")
[1] "fr_FR"
Warning message:
setting 'LC_NUMERIC' may cause R to function strangely in: 
setlocale(category, locale)
> as.numeric(",1")
[1] 0,1
> as.numeric(".1")
[1] NA
Warning message:
NAs introduced by coercion

Assuming you have not done that anywhere, it should not happen. 
If you have, you were warned.  (Have you tried starting R with --vanilla 
to be sure?)

as.numeric() is using strtod which should only be affected by the locale 
category LC_NUMERIC, and R itself does not set LC_NUMERIC.  So either you 
or some rogue OS function must have, unless there is a pretty major bug in 
the OS.  (Just using a UTF-8 fr_FR locale does not do it on either of the 
Linux variants I tried.)

On Wed, 24 Jan 2007, NOEL Yvonnick wrote:

>>    >> as.numeric(",1")
>>     NOEL> [1] 0,1
>> Instead of the output below, can you please give the full
>>
>>      sessionInfo()
>>
>> output?
>
>
> Here it is:
>
> R version 2.4.0 (2006-10-03)
> i686-pc-linux-gnu
>
> locale:
> fr_FR.UTF-8
>
> attached base packages:
> [1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> [7] "base"
>
> other attached packages:
>       lattice   cairoDevice gWidgetsRGtk2         RGtk2      gWidgets
>     "0.14-16"         "1.2"       "0.0-9"       "2.8.6"      "0.0-11"
>
> Yvonnick Noel, PhD.
> Dpt of Psychology
> U. of Rennes
> France
>
> ______________________________________________
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> 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,                  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