On Wed Aug 21 12:09:26 EDT 2013, [email protected] wrote:
> > at least in terms of passing floating point test suites
> > (like python's) the NaN issue doesn't come up
>
> Actually it was a test suite that revealed the NaN errors.
> I wouldn't think it's something anyone needs in normal
> day-to-day computation, but sometimes boxes must be ticked.
:-) it is hard to imagine how this is useful. it's not like
∑{i→∞}-0 is interesting. at least ∏{i→∞}-0 has an alternating
sign. (so does it converge with no limit?)
the difference i have seen is a situation like
atan2(-0, x) ≡ -π
atan2(+0, x) ≡ pi, ∀ x<0.
any ideas on how this is useful?
- erik
