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[Octave-bug-tracker] [bug #57603] quadv gives wrong results integrating

From: Olivier Amoignon
Subject: [Octave-bug-tracker] [bug #57603] quadv gives wrong results integrating sin^2 or cos^2 on multiple of 8 periods
Date: Thu, 16 Jan 2020 04:59:32 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko

Follow-up Comment #4, bug #57603 (project octave):

The singularity reported (the result is wrong on 4 periods=8Pi and not 3
periods=6Pi or 5 periods=10Pi etc...) is a bug because independently of the
accuracy of the method the integration of sin^2 or cos^2 cannot be 0 on an
entire period, so even less so on 4 periods. Also I should mention that the
error appeared when I conducted tests comparing matlab and octave. In matlab
quadv behaves as all other integration methods (quad, quadgk etc ..) and gives
the righ result.


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