[Haskell-beginners] How to improve the accuracy of floating point calculation?

[Patrick Mylund Nielsen]

http://floating-point-gui.de/
http://floating-point-gui.de/formats/fp/

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems


On Wed, Feb 6, 2013 at 12:08 AM, KC <kc1956 at gmail.com> wrote:

> 0.1 cannot be represented exactly in floating point.
>
> 0.5 can be represented exactly.  Why?
>
>
> On Tue, Feb 5, 2013 at 2:41 PM, yi lu <zhiwudazhanjiangshi at gmail.com>
> wrote:
> > Hi,
> >
> > I found that in ghci, I input
> > [0.1,0.2..2]
> > and run, I get a result of
> >
> >
> [0.1,0.2,0.30000000000000004,0.4000000000000001,0.5000000000000001,0.6000000000000001,0.7000000000000001,0.8,0.9,1.0,1.1,1.2000000000000002,1.3000000000000003,1.4000000000000004,1.5000000000000004,1.6000000000000005,1.7000000000000006,1.8000000000000007,1.9000000000000008,2.000000000000001]
> >
> > But, as you know, it is not the exact answer.
> >
> > So, I wonder if there is something I can do to achieve a better
> performance
> > and get [0.1,0.2,0.3,0.4..] as the result.
> >
> > Thanks.
> >
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> >
>
>
>
> --
> --
> Regards,
> KC
>
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