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
>
You could write with_options() as
with_options <-function(optionlist, expr){
oldoptions<-options(optionlist)
on.exit(options(oldoptions))
eval(substitute(expr), parent.frame())
}
and then do
with_options(list(warn=-1), whatever)
-thomas
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