R devel - Oct 2010 - calling browser on error

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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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
>
>
> Note: This email is for the confidential use of the named addressee(s) only
and may contain proprietary, confidential or privileged information. If you are
not the intended recipient, you are hereby notified that any review,
dissemination or copying of this email is strictly prohibited, and to please
notify the sender immediately and destroy this email and any attachments. ?Email
transmission cannot be guaranteed to be secure or error-free. ?Jump Trading,
therefore, does not make any guarantees as to the completeness or accuracy of
this email or any attachments. ?This email is for informational purposes only
and does not constitute a recommendation, offer, request or solicitation of any
kind to buy, sell, subscribe, redeem or perform any type of transaction of a
financial product.
>
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>