On Tue, 24 Apr 2007, Duncan Murdoch wrote:
> On 4/24/2007 4:58 AM, Torsten Hothorn wrote:
>>> nlevels(c("a", "b"))
>> [1] 0
>>
>> but the documentation in R 2.5.0 (and earlier) says
>>
>> If the argument is not a 'factor', 'NA' is returned.
>>
>> I hope it isn't too late, I only came across this in a lecture this
>> morning.
>
> It's too late for 2.5.0, but not for 2.5.1, or 2.6.0, ...
>
> Just to be clear: this is a documentation error, right? The behaviour
> is unchanged back at least as far as 2.2.1.
It is also wrong in that other objects can have levels (in which case
nlevels() reports how many), and I think the sentence should be deleted.
In theory there ought to be a \value section like
\value{
The length of \code{\link{levels}(x)}, which is zero if
\code{x} has no levels.
}
--
Brian D. Ripley, [EMAIL PROTECTED]
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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