[R] setting options only inside functions

luke-tierney at uiowa.edu luke-tierney at uiowa.edu
Wed Apr 27 22:45:16 CEST 2011

Put together a list and we can see what might make sense.  If we did
take this on it would be good to think about providing a reasonable
mechanism for addressing the small flaw in this function as it is
defined here.



On Wed, 27 Apr 2011, Hadley Wickham wrote:

>> 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

Luke Tierney
Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu

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