Modern Symbolic debugger for R programmes?

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I think I am whistling in the wind, but is there a modern symbolic debugger for R programmes?

I am working through some  one else's code, thousands of lines, that has the occasional bug in 
it, and a lot in my understanding of it.

I cannot make setBreakpoint or findLineNum  work.  I get "No source refs found.".  I am 
starting to loose my mind!

A debugger where I could set breakpoints with a little more granularity than the function
level and a little more accessible than the trace function.  What I ideally want is GDB for R.

Does that exist?

There is quite some debugging fuctionality available in ESS for emacs (http://ess.r-project.org/)
and I rmrmber a presentation at useR in 2011 that there is as well in eclipse, but there you have
to used,. as far as I remember, a patched version of R.

So I would suggest to look into ESS for a debugger.

Cheers,

Rainer

cheers Worik

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