He said to use options(error=...) instead of
tryCatch(error=...). In C++ lingo, the handler
set by options("error") is called when the exception
is thrown while tryCatch's handler is called
when it is caught.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-devel-boun...@r-project.org
> [mailto:r-devel-boun...@r-project.org] On Behalf Of Vadim Ogranovich
> Sent: Friday, October 15, 2010 11:45 AM
> To: 'Joshua Ulrich'
> Cc: r-devel@r-project.org
> Subject: Re: [Rd] calling browser on error
>
> Joshua,
>
> I didn't know about 'recover', thank you!
>
> Anyway it doesn't work for me:
> > tryCatch((function() { x <- 1; stop('ok') })(), error=recover())
>
> Enter a frame number, or 0 to exit
>
> 1: tryCatch((function() {
>
> Selection: 1
> Called from: eval(expr, envir, enclos)
> Browse[1]> x
> Error: object 'x' not found
> Browse[1]> Q
>
> Though it does work if I set options(error = recover):
> > options(error = recover)
> > (function() { x <- 1; stop('ok') })()
> Error in (function() { : ok
>
> Enter a frame number, or 0 to exit
>
> 1: (function() {
>
> Selection: 1
> Called from: eval(expr, envir, enclos)
> Browse[1]> x
> [1] 1
> Browse[1]> Q
>
> I do not run the latest R so it might be the reason:
> > version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 9.1
> year 2009
> month 06
> day 26
> svn rev 48839
> language R
> version.string R version 2.9.1 (2009-06-26)
>
>
> -----Original Message-----
> From: Joshua Ulrich [mailto:josh.m.ulr...@gmail.com]
> Sent: Friday, October 15, 2010 1:31 PM
> To: Vadim Ogranovich
> Cc: r-devel@r-project.org
> Subject: Re: [Rd] calling browser on error
>
> I believe options(error=recover) will do what you want.
>
> --
> Joshua Ulrich | FOSS Trading: www.fosstrading.com
>
>
>
> On Fri, Oct 15, 2010 at 1:27 PM, Vadim Ogranovich
> <vogranov...@jumptrading.com> wrote:
> > Dear R-developers,
> >
> > I am trying to figure out a way to call browser() when an
> error occur, and naturally I want the browser() to be called
> in the environment of the error.
> >
> > I tried something simple in vain:
> >
> >> f <- function() { x <- 1; stop('ok') }
> >> tryCatch(f(), error=browser())
> > Called from: tryCatch(f(), error = browser())
> > ## if browser() was called in the local environment of f
> then 'x' would be set, but it's not
> > Browse[1]> x
> > Error: object 'x' not found
> > Browse[1]> Q
> >
> > Is there a way to make it work? What do people do to 'set
> an on-error breakpoint'?
> >
> > Thanks,
> > Vadim
> >
> >
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