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From: | Colin Macdonald |
Subject: | [Octave-bug-tracker] [bug #48307] sinc loses precision for large arguments |
Date: | Mon, 4 Jul 2016 05:49:51 +0000 (UTC) |
User-agent: | Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0 |
Follow-up Comment #14, bug #48307 (project octave): Sorry for speaking imprecisely. Glibc's sin is a backwards stable algorithm: we got the exact answer of a nearby problem, measured relatively. We don't have the exact x, so we don't expect the exact answer. But we hope for a good answer in the backward error sense: the answer we get (5.62e-10) is the exact answer of sin(x+delta) where delta is small in a relative sense to 10000000*pi. This is what I take home from the example in Comment #8 and #5. _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?48307> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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