On Sun, Apr 14, 2013 at 7:53 PM, Kim-Ee Yeoh <k...@atamo.com> wrote: > On Sun, Apr 14, 2013 at 3:28 PM, wren ng thornton <w...@freegeek.org> wrote: >> Whereas the problematic >> values due to infinities are overspecified, so no matter which answer you >> pick it's guaranteed to be the wrong answer half the time. >> >> Part of this whole problem comes from the fact that floats *do* decide to >> give a meaning to 1/0 (namely Infinity). > > I'm not sure what you mean about overspecification here, but in > setting 1/0 as +infinity (as opposed to -infinity), there's an easily > overlooked assumption that the limit is obtained "from above" as > opposed to "from below."
Not quite. 0.0 designates "positive zero" or +0.0 in IEEE 754 notation. There is also "negative zero" or -0.0 in IEEE 754 notation. If you want the limit from below, use negative zero. This is all standard IEEE 754 concepts. -- Gaby _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
