[R] on abort error, always show call stack?

[Matt Shotwell]

On Sun, 2010-08-22 at 11:41 -0400, ivo welch wrote:
> Dear R Wizards---is it possible to get R to show its current call
> stack (sys.calls()) upon an error abort?  I don't use ESS for
> execution, and it is often not obvious how to locate how I triggered
> an error in an R internal function.  Seeing the call stack would make
> this easier.  (right now, I sprinkle "cat" statements everywhere, just
> to locate the line where the error appears.)  Of course, I would
> really love to see the line in my program that triggered this, but I
> have asked this before, and I understand this is too difficult to get
> into the R language.

The traceback() function will print out the call stack after an error.
However, you may find the debug() family of functions more useful for
debugging. Also see the browser() function.

-Matt

> 
> regards,
> 
> /iaw
> 
> ----
> Ivo Welch (ivo.welch at brown.edu, ivo.welch at gmail.com)
> 
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-- 
Matthew S. Shotwell
Graduate Student 
Division of Biostatistics and Epidemiology
Medical University of South Carolina