[R] how to stop without error message?

[John Fox]

Dear Mark,

How about something like this?

> f <- function(x){
+   if (x < 0){
+     opt <- options(show.error.messages=FALSE)
+     on.exit(options(opt))
+     stop()
+     }
+   sqrt(x)
+   }
> 
> f(2)
[1] 1.414214
> f(-2)
>

I hope this helps,
 John

------------------------------
John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
> Behalf Of Mark.Bravington at csiro.au
> Sent: November-10-08 5:42 PM
> To: R-help at r-project.org
> Cc: Mark.Bravington at csiro.au
> Subject: [R] how to stop without error message?
> 
> Dear list
> 
> Can anyone suggest a simple way to abort execution like stop(...) does,
but
> without issuing an "Error: ..." message?
> 
> I don't want to set 'options( show.error.messages=TRUE)' because I want
> normal behaviour to resume after this particular stop.
> 
> (Please reply personally as well as to the list, as I'm not subscribed to
R-
> help)
> 
> Thanks
> Mark
> 
> --
> Mark Bravington
> CSIRO Mathematical & Information Sciences
> Marine Laboratory
> Castray Esplanade
> Hobart 7001
> TAS
> 
> ph (+61) 3 6232 5118
> fax (+61) 3 6232 5012
> mob (+61) 438 315 623
> 
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