On 11/16/2007 9:48 AM, Yan Wong wrote:
> On 16 Nov 2007, at 14:16, Duncan Murdoch wrote:
>
>> On 11/16/2007 6:58 AM, Yan Wong wrote:
>>> Hi,
>>> I can't seem to find a way to do this (i.e. interrupt a routine at
>>> an arbitrary time during its run, then step into it using the
>>> debugger).
>>
>> If you prepare in advance by using options(error=recover), it's easy:
>>
>> > options(error=recover)
>> > f <- function() {
>> + i <- 0
>> + repeat {
>> + i <- i + 1
>> + x <- rnorm(10000)
>> + }
>> + }
>> > f()
>>
>> # At this point, R appears hung up. I hit Esc in the Windows
>> Rgui. In Unix or Rterm, you'd use Ctrl-C.
>
> That's exactly what I wanted. Thank you. I didn't realise that
> sending an interrupt signal was treated as a "normal" error.
>
> Out of interest, is there any way to resume the routine from where it
> was interrupted (and ideally do so in debugger mode, so I can step
> through the lines of the code)?
I don't think so, I think you need to use explicit browser() or
recover() calls in your code for that. It would be a nice addition to
have a way to tell the interpreter to insert a recover() call before the
executing the next statement (like a "Program Pause" command in some
debuggers), but as far as I know there isn't a way to do that.
Duncan Murdoch
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