R devel - Oct 2006 - Bug in warning() for condition objects (PR#9274)

Full_Name: David Hinds
Version: 2.4.0
OS: Windows XP
Submission from: (NULL) (64.168.232.238)


A (maybe naive) use of tryCatch to trap errors and report as warnings does not
work, i.e.:

  x <- tryCatch(lm(xyzzy), error=warning)

In src/library/base/R/stop.R, the warning() function contains the following
code, for handling condition objects:

        withRestarts({
            .Internal(.signalCondition(cond, message, call))
            .Internal(.dfltStop(message, call))
        }, muffleWarning = function() NULL)

So all conditions result in calling .dfltStop().  It would seem more useful
and/or consistent for warning() to call .dfltWarn(), or in the alternative, to
choose between .dfltStop and .dfltWarn based on the class of the condition
object.

Thanks.  I think your analysis is probably correct.  Will look into
this and fix shortly.

Best,

luke

On Wed, 4 Oct 2006, dhinds at sonic.net wrote:
> Full_Name: David Hinds
> Version: 2.4.0
> OS: Windows XP
> Submission from: (NULL) (64.168.232.238)
>
>
> A (maybe naive) use of tryCatch to trap errors and report as warnings does
not
> work, i.e.:
>
>  x <- tryCatch(lm(xyzzy), error=warning)
>
> In src/library/base/R/stop.R, the warning() function contains the following
> code, for handling condition objects:
>
>        withRestarts({
>            .Internal(.signalCondition(cond, message, call))
>            .Internal(.dfltStop(message, call))
>        }, muffleWarning = function() NULL)
>
> So all conditions result in calling .dfltStop().  It would seem more useful
> and/or consistent for warning() to call .dfltWarn(), or in the alternative,
to
> choose between .dfltStop and .dfltWarn based on the class of the condition
> object.
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
-- 
Luke Tierney
Chair, 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