On Sat, 2009-08-22 at 13:03 -0400, haskell-cafe-requ...@haskell.org wrote: > Message: 10 > Date: Sat, 22 Aug 2009 11:24:21 +0200 > From: Roberto L?pez <plasterm...@hotmail.com> > Subject: [Haskell-cafe] Re: Is logBase right? > To: haskell-cafe@haskell.org > Message-ID: <h6odg8$93...@ger.gmane.org> > Content-Type: text/plain; charset="ISO-8859-1" > > If 4.0 / 2.0 was 1.9999999999999999999998, it would be ok? > > The real value of log10 1000 is 3 (3.0). It can be represented with > accuracy > and it should be. > > You get the accuracy value in Perl, but there is the same problem in > Python. > It's a bit discouraging. >
There is *not* the same problem in Python: $ python Python 2.6.2 (r262:71600, Jul 9 2009, 23:16:53) [GCC 4.4.0 20090506 (Red Hat 4.4.0-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import math >>> math.log10(1000) 3.0 Recent work in Python 3 (and Python 2.6) has improved the handling of floating point numbers, and addresses exactly the problem that Roberto has raised. I see no reason why Haskell could not improve its handling of floating point numbers by using similar techniques. Steve _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
