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

I'm not sure how CReal implements its values, but IEEE754 also supports decimal formats preferred for accuracy in many applications. Take a look: http://en.wikipedia.org/wiki/IEEE_floating_point Cheers, d On Tue, Feb 5, 2013 at 3:24 PM, Patrick Mylund Nielsen < haskell@patrickmylund.com> wrote:

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 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 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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