R devel - Aug 2007 - silent option in nested calls to try()

Hello,

is it *really intentional* that the "silent" option of try() does only
apply to the outer call in nested try constructs? I would assume that a 
silent try() should suppress all error messages regardless where they 
occur, even if they are already handled with other try()'s.

The error message itself should be (and is in both cases) reported by 
the return value of try().

Thanks in advance

Thomas


## Old behavior (tested with R-2.4.1):
 >  try(try(exp(NULL)), silent=TRUE)
 >


## Current behavior (R-2.6.0 unstable, build 42641, WinXP):
 >  try(try(exp(NULL)), silent=TRUE)
Error in exp(NULL) : Non-numeric argument to mathematical function
 >



-- 
Thomas Petzoldt
Technische Universitaet Dresden
Institut fuer Hydrobiologie
01062 Dresden
GERMANY

http://tu-dresden.de/Members/thomas.petzoldt

Yes.  If you want finer control use tryCatch.

Best,

luke

On Mon, 27 Aug 2007, Thomas Petzoldt wrote:
> Hello,
>
> is it *really intentional* that the "silent" option of try() does
only
> apply to the outer call in nested try constructs? I would assume that a
> silent try() should suppress all error messages regardless where they
> occur, even if they are already handled with other try()'s.
>
> The error message itself should be (and is in both cases) reported by
> the return value of try().
>
> Thanks in advance
>
> Thomas
>
>
> ## Old behavior (tested with R-2.4.1):
> >  try(try(exp(NULL)), silent=TRUE)
> >
>
>
> ## Current behavior (R-2.6.0 unstable, build 42641, WinXP):
> >  try(try(exp(NULL)), silent=TRUE)
> Error in exp(NULL) : Non-numeric argument to mathematical function
> >
>
>
>
>
-- 
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