[Rd] calling browser on error

[William Dunlap]

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-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.
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
> 
> 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.
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>