[Rd] calling browser on error

[Vadim Ogranovich]

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.ulrich at gmail.com]
Sent: Friday, October 15, 2010 1:31 PM
To: Vadim Ogranovich
Cc: r-devel at 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
<vogranovich at 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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