[Rd] trySilent (was try.Silent)

[Kurt Hornik]

>>>>>   writes:

> We could, and it had crossed my mind.  Thanky ou for raising it.
> However, we could not do that before 1.7.0 (new feature, and
> anyway 1.6.2 is in final testing for release in a couple of days).

> We have been considering having package methods in the default package
> list for 1.7.0, which would provide this.  However, my preference would be
> to have this as an argument to try, as in try(..., silent=TRUE)
> Note that trySilent actually does two things:

> i) it sets options(show.error.messages = FALSE)
> ii) it sets options(error = empty.dump) (or equivalently) to suppress
> any error handler

> and one might just want just one of those two.  Do perhaps

> try(..., silent = FALSE, nodump= TRUE)

> (or defaulting nodump to silent) might be a comprehensive interface.

> Any preferences?

[Anticipating Luke's comment, or at least trying to ...]

Wouldn't it be better to more generally have a way of executing with
options temporarily reset in a 'safe' way, a la

	withOptions(EXPR, list(show.error.messages = FALSE, ...))

-k

> On Wed, 8 Jan 2003, Paulo Justiniano Ribeiro Jr wrote:

>> In an email to the help list John Chambers
>> wrote about the function helpSilent which is in the methods package,
>> pointing out that there is no restrictive reason to be in this package.
>> 
>> I did not know about this function and just incorporate it in several
>> functions of the geoR package where a much less elegant solution was
>> being used.
>> 
>> I guess other packages could use it as well.
>> Therefore, would be an idea to move trySilent() to `base' ?
>> 
>> Cheers
>> P.J.
>> 
>> --
>> Paulo Justiniano Ribeiro Jr
>> Departamento de Estatística
>> Universidade Federal do Paraná
>> Caixa Postal 19.081
>> CEP 81.531-990
>> Curitiba, PR  -  Brasil
>> 
>> Tel: (+55) 41 361 3471
>> Fax: (+55) 41 361 3141
>> 
>> e-mail: Paulo.Ribeiro@est.ufpr.br
>> http://www.est.ufpr.br/~paulojus (portugues)
>> http://www.maths.lancs.ac.uk/~ribeiro (english)
>> 
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> -- 
> 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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