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Re: [Bug-gsl] Bug-gsl Digest, Vol 99, Issue 6
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From: |
Brian Gough |
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Subject: |
Re: [Bug-gsl] Bug-gsl Digest, Vol 99, Issue 6 |
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Date: |
Wed, 13 Apr 2011 21:10:00 +0100 |
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User-agent: |
Wanderlust/2.15.6 (Almost Unreal) Emacs/23.2 Mule/6.0 (HANACHIRUSATO) |
At Tue, 12 Apr 2011 18:33:04 -0400,
James Ward wrote:
>
> I did some timing tests, and it looks like Moler & Morrision is about
> twice as slow as gsl_hypot(), up to the same accuracy (1e-15).
>
> http://steve.hollasch.net/cgindex/math/pythag-root.txt
>
> suggests this is due to M&M being cubically convergent, while
> gsl_hypot() is quadratically convergent. So ... never mind!
>
Interesting read! Thanks for that.