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| Sine and Cosine Accuracy on AMD64 and Pentium 4 scott.ladd@coyotegulch.com (Scott Robert Ladd) (2005-05-26) |
| Re: Sine and Cosine Accuracy on AMD64 and Pentium 4 gah@ugcs.caltech.edu (glen herrmannsfeldt) (2005-05-28) |
| Re: Sine and Cosine Accuracy on AMD64 and Pentium 4 jcrens@earthlink.net (Jack Crenshaw) (2005-07-17) |
| Re: Sine and Cosine Accuracy on AMD64 and Pentium 4 Juergen.Kahrs@vr-web.de (=?ISO-8859-1?Q?J=FCrgen_Kahrs?=) (2005-07-17) |
| Re: Sine and Cosine Accuracy on AMD64 and Pentium 4 gah@ugcs.caltech.edu (glen herrmannsfeldt) (2005-07-22) |
| Re: Sine and Cosine Accuracy on AMD64 and Pentium 4 henry@spsystems.net (2005-07-26) |
| From: | =?ISO-8859-1?Q?J=FCrgen_Kahrs?= <Juergen.Kahrs@vr-web.de> |
| Newsgroups: | comp.compilers |
| Date: | 17 Jul 2005 20:45:31 -0400 |
| Organization: | Compilers Central |
| References: | 05-05-215 05-07-075 |
| Keywords: | arithmetic |
| Posted-Date: | 17 Jul 2005 20:45:31 EDT |
Jack Crenshaw wrote:
> 1) are you sure your value of pi is not part of the problem?
> I have always been told to let the numeric processor set
> its own value, which it knows internally at 80-bit accuracy.
> You can get that value using something like
>
> pi = 4 * atan(1);
When using POSIX C, you can also use M_PI
http://www.opengroup.org/onlinepubs/009695399/basedefs/math.h.html
With other languages (like awk) I also use 4 * atan2(1,1).
atan2 (as opposed to atan) is 'more standard'.
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