> This has the side effect of ignoring errors
> and even hiding the error messages. If you
> are concerned about multiple calls to on.exit()
> in one function you could define a new function
> like
> withOptions <- function(optionList, expr) {
> oldOpts <- options(optionList)
> on.exit(options(oldOpts))
> expr # lazily evaluate
> }
I wish R had more functions like this. This sort of behaviour is also
useful when you open connections or change locales. Ruby's blocks
provide nice syntactic sugar for this idea.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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