[R] R code debugging

[Vadim Ogranovich]

You might want to check out the "debug" package on CRAN:

debug: MVB's debugger for R

Debugger for R functions, with code display, graceful error recovery,
line-numbered conditional breakpoints, access to exit code, flow
control, and full keyboard input.
Version:	1.0.1
Depends:	R (>= 1.8), mvbutils, tcltk
Date:	18/2/2004
Author:	Mark V. Bravington
Maintainer:	Mark V. Bravington
License:	GPL version 2 or later

 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Prof 
> Brian Ripley
> Sent: Tuesday, November 09, 2004 4:16 AM
> To: Timur Elzhov
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] R code debugging
> 
> On Tue, 9 Nov 2004, Timur Elzhov wrote:
> 
> > it's quite difficult for me to find `Error:'s in my R code, 
> because R 
> > does say about error itself, but say nothing about its 
> location, say, 
> > string number and file with an error (which may be 
> `source'd from another file).
> > Are there any option for turning of the similar feature, or 
> R can not 
> > do such a thing at all?
> 
> R code can be created dynamically by R code (called 
> `computing on the language'), and in most cases the source 
> code is not retained (and it is not used for execution).
> 
> traceback() will always tell you the function in which the 
> error occurred.
> If you write reasonably modular code that should suffice, but 
> if not, use debug() on that function and single-step through 
> it to find where the error occurs.  Or set a suitable error 
> handler: have you explored recover(), for example?
> 
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
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