[R] Scoped options setting?

[Prof Brian Ripley]

?on.exit

But here, you want suppressWarnings.

On Wed, 16 May 2007, Zack Weinberg wrote:

> Is there any way to set options during the evaluation of a particular
> expression, with them automatically reset when control leaves that
> expression, however that happens?  Kind of like "let" on a "special"
> variable does in Lisp.  I naively tried
>
> with(options(warn=-1), {
>    fit <- fitdistr(data, 'weibull')  # complains about NaNs
> })
>
> but this leaves options('warn') set to -1 afterward.  I can save and
> restore the value explicitly, but then if fitdistr() throws an error,
> it won't get reset...

-- 
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)
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