Re: [Haskell-cafe] Arbitrary precision?
On Sun, 6 May 2007, Andrew Coppin wrote: Greetings. Haskell has arbitrary precision integers, in the form of the Integer type. Is there a type somewhere that implements arbitrary precision fractional values? Whatever you want: http://haskell.org/haskellwiki/Applications_and_libraries/Mathematics#Number_representations ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
On Sun, May 06, 2007 at 05:15:08PM +0100, Andrew Coppin wrote: Greetings. Haskell has arbitrary precision integers, in the form of the Integer type. Is there a type somewhere that implements arbitrary precision fractional values? Yes, Rational in the Prelude (with extra functions in Ratio) Prelude let fibs = (1::Rational) : 1 : zipWith (+) fibs (tail fibs) Prelude let grs = zipWith (/) (tail fibs) fibs Prelude take 10 grs [1%1,2%1,3%2,5%3,8%5,13%8,21%13,34%21,55%34,89%55] Prelude take 10 (zipWith (-) grs (tail grs)) [(-1)%1,1%2,(-1)%6,1%15,(-1)%40,1%104,(-1)%273,1%714,(-1)%1870,1%4895] Prelude ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
Greetings. Haskell has arbitrary precision integers, in the form of the Integer type. Is there a type somewhere that implements arbitrary precision fractional values? Yes, Rational in the Prelude (with extra functions in Ratio) Prelude let fibs = (1::Rational) : 1 : zipWith (+) fibs (tail fibs) Prelude let grs = zipWith (/) (tail fibs) fibs Prelude take 10 grs [1%1,2%1,3%2,5%3,8%5,13%8,21%13,34%21,55%34,89%55] Prelude take 10 (zipWith (-) grs (tail grs)) [(-1)%1,1%2,(-1)%6,1%15,(-1)%40,1%104,(-1)%273,1%714,(-1)%1870,1%4895] Prelude Ah yes, you're right. Well, you learn something every day... OOC, is there a reason why you can't just write 5%10? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
On May 6, 2007, at 12:59 , Andrew Coppin wrote: OOC, is there a reason why you can't just write 5%10? Prelude :t 5%10 interactive:1:1: Not in scope: `%' Prelude :m +Data.Ratio Prelude Data.Ratio :t 5%10 5%10 :: (Integral t) = Ratio t Prelude Data.Ratio I'm actually a bit surprised that's not in Prelude. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] [EMAIL PROTECTED] system administrator [openafs,heimdal,too many hats] [EMAIL PROTECTED] electrical and computer engineering, carnegie mellon universityKF8NH ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
Brandon S. Allbery KF8NH wrote: OOC, is there a reason why you can't just write 5%10? Prelude :t 5%10 interactive:1:1: Not in scope: `%' Prelude :m +Data.Ratio Prelude Data.Ratio :t 5%10 5%10 :: (Integral t) = Ratio t Prelude Data.Ratio I'm actually a bit surprised that's not in Prelude. Likewise... Oh, by the way, thanks for the extra syntax. It's really annoying having to locate Notepad.exe on the start menu, type import Blah, save it as Thing.hs, open Windoze Explorer, locate Thing.hs, and then double-click it just so that I can try stuff out in GHCi... ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
Andrew Coppin wrote: ... Likewise... Oh, by the way, thanks for the extra syntax. It's really annoying having to locate Notepad.exe on the start menu, type import Blah, save it as Thing.hs, open Windoze Explorer, locate Thing.hs, and then double-click it just so that I can try stuff out in GHCi... ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe God that sounds painful. As well as reading about ghci [1] you might consider Emacs and haskell-mode for a productive environment. [1] http://www.haskell.org/ghc/docs/6.4.2/html/users_guide/ghci.html -- View this message in context: http://www.nabble.com/Arbitrary-precision--tf3700066.html#a10348633 Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Arbitrary precision?
On 06/05/07, Andrew Coppin [EMAIL PROTECTED] wrote: Oh, by the way, thanks for the extra syntax. It's really annoying having to locate Notepad.exe on the start menu, type import Blah, save it as Thing.hs, open Windoze Explorer, locate Thing.hs, and then double-click it just so that I can try stuff out in GHCi... Any reason you can't use :module Blah in GHCi? -- -David House, [EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
