calling browser on error

-----Original Message-----
From: r-devel-bounces at r-project.org 
[mailto:r-devel-bounces at r-project.org] On Behalf Of Vadim Ogranovich
Sent: Friday, October 15, 2010 11:45 AM
To: 'Joshua Ulrich'
Cc: r-devel at 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.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


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.

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.