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Re: -0.0 versus 0.0
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From: |
Andrea Fedeli |
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Subject: |
Re: -0.0 versus 0.0 |
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Date: |
Sun, 22 Feb 2009 17:42:48 +0100 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.19) Gecko/20081204 SeaMonkey/1.1.14 |
Dave Sworin wrote:
?- R is 0, THETA is 3.1415, X is R * cos(THETA).
R = 0
THETA = 3.1415000000000002
X = -0.0
A .5 cents worth comment: curiously, the exact same behavior is exposed
by SWI 5.6.50 and Ciao 1.10p8, at least on my machine/OS combination
(Athlon XP 2800+/OpenSuse 11.0). It very roughly seems like something
related either to a shared library or to a common portion of source code.
cheers,
Andrea.
--
Andrea Fedeli
Dawn, n.:
The time when men of reason go to bed.
-- Ambrose Bierce, "The Devil's Dictionary"