[R] enter browser on error

[Prof Brian Ripley]

Have you tried options(error=recover)?

On Tue, 31 Aug 2004, Bickel, David wrote:

> Is there a way I can get R to automatically enter the browser inside a user-defined function on the generation of an error? Specifically, I'm trying to debug this:
> 
> Error in as.double.default(sapply(lis, FUN)) : 
>         (list) object cannot be coerced to double
> In addition: There were 38 warnings (use warnings() to see them)
> > traceback()
> 8: as.double.default(sapply(lis, FUN))
> 7: as.numeric(sapply(lis, FUN))
> 6: numeric.sapply(function(x) {
>        x at statistic0
>    })
> 
> On detection of the error, I would like browser() to be called at the
> level of numeric.sapply(), so that I can examine x. I'm wondering if
> this can be done by modifying the default error handling. Using try()
> with browser() didn't work.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595