[Rd] Very Long Expressions
luke at stat.uiowa.edu
Tue Jan 25 21:09:50 CET 2005
On Mon, 24 Jan 2005, Thomas Lumley wrote:
> On Mon, 24 Jan 2005, Prof Brian Ripley wrote:
> > On Mon, 24 Jan 2005, McGehee, Robert wrote:
> > [Instructions to the R developers deleted.]
> >> Secondly, the ?options help (thanks for everyone who reminded me about
> >> this), says that expressions can have values between 25...100000.
> >> However, if the original example is set past 4995 on my computers, I
> >> receive a stack overflow.
> > More accurately, you caused a protection stack overflow.
> At one point we were concerned about overflowing the C stack if
> options(expressions=) were set too high. I think this was in the days
> when MacOS had a very small stack, and that things are safer now.
I hadn't noticed that they finally kicked the default up to 8M--good.
We still need to be a bit careful since running out of C stack will
cause a protection violation and there is no portabmle way to catch
this. But we can probably afford to loosen the defaults a bit.
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