[ESS] Debugging in R
Kasper Daniel Hansen
kaha at biostat.ku.dk
Sat Jun 25 01:29:11 CEST 2005
On Fri, 24 Jun 2005, Ross Boylan wrote:
> On Fri, 2005-06-24 at 21:41 +0200, Kasper Daniel Hansen wrote:
> > I think that what Martin observed is that some ESS functionality hangs.
> > Eg. ESS has tab completion for the help function, and that does not work
> > in a recover session. But I think that what you are describing is
> > something different - that everything hangs?
> > So let me clarify: when I do
> > options(error = recover) it works exactly as under the console - but I
> > might have problems with some extended ESS functionality.
> > Your message seems to indicate that it worked recently. I am using
> > Emacs 220.127.116.11 under Mac Os Tiger with ESS 52.8 (the newest).
> > I am not sure I can help further - I am quite mystified if using
> > options(error = recover) crashes the Emacs session...
> I've narrowed the problem down. I did
> foo <- function() stop("")
> under ESS and everything worked fine. However, when I put the call
> foo() in a file and did C-c C-l, everything hung. It is not using any
> So I guess the standard input is redirected to the file, and gets stuck.
> Is there a way around that?
Ahh you. Well in that case I get exactly the same results like you - I
guess the interactivity screws up (which is kind of natural). You
shoudl be able to regain control of Emacs by using C-g, but that will not
give you the results you want. You can get what you want by doing
instead of C-c C-l. What I sually do is having the script open in a
separate buffer and then use
C-c C-n to step through it a line at a time
C-c C-f to evaulate a function
C-c C-b to dump the whole buffer.
In the last case it will hang at the error like it does with C-c C-l but
by pressing C-g I can regain control and when I switch to the *R* buffer I
see the recoveer prompt waiting for me.
I guess I am simply using another type of workflow, I never use C-c C-l
(but now someone will tell me it is the best thing since sliced bread :)
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