David Roundy <[EMAIL PROTECTED]> wrote: > On Thu, Jan 10, 2008 at 09:41:53PM +0100, Achim Schneider wrote: > > David Roundy <[EMAIL PROTECTED]> wrote: > > > On Thu, Jan 10, 2008 at 09:24:34PM +0100, Achim Schneider wrote: > > > > John Meacham <[EMAIL PROTECTED]> wrote: > > > > > 1/0 = Infinity > > > > > -1/0 = -Infinity > > > > > > > > Just out of curiosity: > > > > > > > > 1/-0 = -Infinity? > > > > -1/-0 = Infinity? > > > > > > Yes. (You could have tried this for yourself, you know... but I > > > suppose haskell-cafe isn't a bad interactive Haskell interpreter, > > > perhaps more user friendly than ghci.) > > > > Prelude> 1 `div` 0 > > *** Exception: divide by zero > > > > That's it. One just shouldn't just extrapolate and think you didn't > > mean GHC but IEEE... > > Prelude> 1/(-0) > -Infinity > > You need to use the / operator, if you want to do floating-point > division. > Yes, exactly, integers don't have +-0 and +-infinity... only (obviously) a kind of nan.
It's just that with the stuff I do I know I have some logical problem in my formulas when I get any special floating point value anywhere, and using --excess-precision can only make the numbers more precise. Said differently: I don't know a thing about floats or numerics. -- (c) this sig last receiving data processing entity. Inspect headers for past copyright information. All rights reserved. Unauthorised copying, hiring, renting, public performance and/or broadcasting of this signature prohibited. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
