[R] Strange warning in summary.lm

[Prof Brian Ripley]

On Wed, 25 Jul 2007, ONKELINX, Thierry wrote:

>> -----Oorspronkelijk bericht-----
>> Van: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
>> Verzonden: woensdag 25 juli 2007 12:20
>> Aan: ONKELINX, Thierry
>> CC: r-help at stat.math.ethz.ch
>> Onderwerp: Re: [R] Strange warning in summary.lm
>>
>> On Wed, 25 Jul 2007, ONKELINX, Thierry wrote:
>>
>>> Dear Peter, Uwe and Brian,
>>>
>>> I've found some more problems with options(OutDec = ",").
>>>
>>> 1) as.numeric yields NA where it shouldn't
>>
>> It should: where does it say otherwise?  OutDec affects output, only.
>
> I was doing something like
>
>> options(OutDec = ",")
>> df <- data.frame(var = rep(1:8/4, 10), x = rnorm(80))
>> df.a <- aggregate(df$x, by = list(var = df$var), FUN = sum)
>> as.numeric(df.a$var)
> [1] NA NA NA  1 NA NA NA  2
> Warning message:
> NAs introduced by coercion in: as.double.default(df.a$var)
>
> because I needed df.a$var as numeric again.

And as Martin maechler has pointed out, we don't (and can't because ',' is 
used for other things) support that.

>
>>> 2) anova yields the same warning as summary
>>
>> It does not in current R: try any fairly recent version of R-devel.
>>
>> Please don't keep reporting a problem we have already fixed,
>> as the FAQ and the posting guide explicitly ask of you.
>
> Sorry about that. I wasn't aware that the error was in a fixed
> subroutine that is used by summary and anova.
> I'm hestating to use a R-devel version because I haven't tried
> installing R from a tar.gz (I'm one of those lazy windows users that
> prefer the .exe version). For now I think I'll return to the good old
> option(OutDec = ".").

Binary versions are available on CRAN.

-- 
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