RE: [R] recover should send messages to stderr, not stdout

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From: Prof Brian Ripley (ripley@stats.ox.ac.uk)
Date: Thu 13 May 2004 - 05:30:01 EST


Message-id: <Pine.LNX.4.44.0405122025240.17678-100000@gannet.stats>

On Wed, 12 May 2004, Vadim Ogranovich wrote:

>
>
> > -----Original Message-----
> > From: Prof Brian Ripley [mailto:ripley@stats.ox.ac.uk]
> > Sent: Tuesday, May 11, 2004 11:21 PM
> > To: Vadim Ogranovich
> > Cc: R-Help
> > Subject: Re: [R] recover should send messages to stderr, not stdout
> >
> ...
> >
> > Note that some of us consider recover() to be designed for
> > interactive-only use, and use something like
>
> Unfortunately, R help doesn't reflect the apparent diversity of
> opinions. Regarding recover it says

Well, I got my suggestion from the work of the author of those words,
on page 268 of the Green Book, so I don't think your `apparent' is based
on careful reading.

> The use of 'recover' largely supersedes 'dump.frames' as an error
> option, unless you really want to wait to look at the error. If
> 'recover' is called in non-interactive mode, it behaves like
> 'dump.frames'. <...>
>
> > options(error=expression(if(interactive()) recover() else
> > dump.calls()))
>
> This is useful. Thank you very much for the tip!
>
> > On Tue, 11 May 2004, Vadim Ogranovich wrote:
> >
> > > recover() sends all its messages, which I consider to be error
> > > messages, to stdout. I think they more properly belong to stderr.
> > >
> > > This is an important difference for those of us who use R in batch
> > > mode to generate ASCII files.
> >
> > Only to the subset who believe that recover() is a useful
> > error option in
> > non-interactive use.
>
> This subset is likely to include everyone who carefully reads the
> documentation, see the above excerpt from a help page.

Everyone who reads that carefully will realize that in batch use you do
want (and need) to wait for the error.

-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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