From: Robert Roessler <roessler@rftp.com>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Multiplication of matrix in C and OCaml
Date: Fri, 09 Feb 2007 17:16:59 -0800 [thread overview]
Message-ID: <45CD1D0B.4050902@rftp.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0702092000180.19734@localhost>
Brian Hurt wrote:
> On Fri, 9 Feb 2007, Andrej Bauer wrote:
>
>> I hate to add to this long discussion, but since when is floating
>> point multiplication associative?
>>
>> # 1.3 *. (0.7 *. 2.1) = (1.3 *. 0.7) *. 2.1 ;;
>> - : bool = false
>
> Round off error. You can't represent numbers like 7/10 or 13/10 in
> binary precisely in a finite number of digits, any more than you can
> represent the numbers 1/3 or 4/7 precisely in base-10 in a finite number
> of digits. This is a fundamental problem with floating point numbers,
> and shows up in every language that has them. But this means reordering
> the calculations will result in slightly different answers.
I had assumed this was the point he was making...
Robert Roessler
roessler@rftp.com
http://www.rftp.com
next prev parent reply other threads:[~2007-02-10 1:17 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-07 23:42 Frédéric Gava
2007-02-08 2:14 ` [Caml-list] " Jacques Garrigue
2007-02-08 9:27 ` Frédéric Gava
2007-02-08 9:38 ` Frédéric Gava
2007-02-08 12:08 ` Jacques Garrigue
2007-02-08 9:56 ` Frédéric Gava
2007-02-08 10:45 ` Xavier Leroy
2007-02-08 15:16 ` Frédéric Gava
2007-02-09 2:58 ` Jacques Garrigue
2007-02-09 9:06 ` ls-ocaml-developer-2006
2007-02-09 10:32 ` ls-ocaml-developer-2006
2007-02-09 14:22 ` skaller
2007-02-09 21:47 ` ls-ocaml-developer-2006
2007-02-09 21:55 ` Andrej Bauer
2007-02-09 22:36 ` ls-ocaml-developer-2006
2007-02-09 23:53 ` Jon Harrop
2007-02-10 1:41 ` ls-ocaml-developer-2006
2007-02-10 2:24 ` Jon Harrop
2007-02-10 14:41 ` ls-ocaml-developer-2006
2007-02-10 14:52 ` Jon Harrop
2007-02-10 15:51 ` ls-ocaml-developer-2006
2007-02-10 16:10 ` Xavier Leroy
2007-02-10 16:11 ` Jon Harrop
2007-02-10 14:55 ` Mattias Engdegård
2007-02-11 13:13 ` Christophe Raffalli
2007-02-10 1:10 ` Brian Hurt
2007-02-10 1:16 ` Robert Roessler [this message]
2007-02-09 23:56 ` Jon Harrop
2007-02-09 12:05 ` Jon Harrop
2007-02-09 12:35 ` ls-ocaml-developer-2006
2007-02-09 13:50 ` Brian Hurt
2007-02-09 14:23 ` Gerd Stolpmann
2007-02-09 14:24 Frederic GAVA
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