[Rd] demo(is.things) fails (PR#772)

[Prof Brian Ripley]

> From: B.Rowlingson@lancaster.ac.uk
> Date: Mon, 18 Dec 2000 13:46:04 +0100 (MET)
> To: r-devel@stat.math.ethz.ch
> Subject: [Rd] demo(is.things) fails (PR#772)
> CC: R-bugs@biostat.ku.dk
> X-Loop: R-bugs@biostat.ku.dk
> 
> Full_Name: Barry Rowlingson
> Version: R-1.2.0
> OS: RH7/i386
> Submission from: (NULL) (148.88.0.11)
> 
> 
> demo(is.things) fails with:
> 
> > is.ALL(NULL)
> Error in as.POSIXct.default(x) : Don't know how to convert `x' to class
> "POSIXct"
> In addition: Warning message: 
> is.nan() applied to non-(list or vector) in: fn(obj) 
> 
>  - this seems to be because it is calling:
> 
> > is.na.POSIXlt(NULL)
> Error in as.POSIXct.default(x) : Don't know how to convert `x' to class
> "POSIXct"
> 
>  is.na.POSIXlt(NA) gives the same error, and there's nothing on NA's or
> NULL's in the documentation for the POSIX{l,c}t functions. It seems that
> errors in these functions cause 'stop()' calls rather than returning NA's.

That's a *method* for is.na which should not be called directly by users.
It should only be called with an argument inheriting from class POSIXlt.

I have no idea why anyone wrote a demo to call methods directly, but after
four years it looks like it needs updating.

-- 
Brian D. Ripley,                  ripley@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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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