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Today's Topics:
1. Re: How to improve the accuracy of floating point
calculation? (KC)
----------------------------------------------------------------------
Message: 1
Date: Tue, 5 Feb 2013 17:58:33 -0800
From: KC <[email protected]>
Subject: Re: [Haskell-beginners] How to improve the accuracy of
floating point calculation?
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Message-ID:
<camlkxykyk1j7tuecb6hdgt9b82mby4d+3wrcolxwjbd3gkd...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I should have been more precise; I truncated my own remarks.
0.1 cannot be represented exactly in floating point because it is not
a power of two; whereas, 0.5 is 1/2 = 2^(-1).
Floating point stores its mantissa as binary bits.
On Tue, Feb 5, 2013 at 4:47 PM, Mateusz Kowalczyk
<[email protected]> wrote:
> I thought that KC was asking why is 0.5 not displayed as 0.5 when it's
> supported by the IEEE754. Even if that wasn't question, it is my
> question now.
>
> IEEE754 is capable of representing 0.5 with perfect precision; in fact,
> it would be `00111111000000000000000000000000'.
>
> My question is why [0.1, 0.2 .. 1.0] comes up with an imprecise
> midpoint:
> [0.1,0.2,0.30000000000000004,0.4000000000000001,0.5000000000000001,0.6000000000000001,0.7000000000000001,0.8,0.9,1.0]
>
>
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--
--
Regards,
KC
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