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Re: [Help-gsl] Double vs Long Double
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From: |
Brian Gough |
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Subject: |
Re: [Help-gsl] Double vs Long Double |
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Date: |
Thu, 04 Oct 2007 19:53:39 +0100 |
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User-agent: |
Wanderlust/2.14.0 (Africa) Emacs/22.1 Mule/5.0 (SAKAKI) |
At Tue, 2 Oct 2007 12:09:00 +0000 (GMT),
dave wrote:
> I tried computing J0(5) using the Bessel function in the gnu math
> library and I got the exact result listed in the book. So I'm wondering
> if the difference in the final 3 digits is the result of using double
> (64-bit xmm registers vs long double (80-bit temp real in 8087 registers).
You can use the GSL_IEEE_MODE=double-precision setting (described in
the IEEE Chapter of the manual) to turn off the 80-bit mode and see if
it makes a difference.
--
Brian Gough
(GSL Maintainer)
Network Theory Ltd,
Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/