[Octave-bug-tracker] [bug #57603] quadv gives wrong results integrating sin^2 or cos^2 on multiple of 8 periods

[Kai Torben Ohlhus]

Follow-up Comment #1, bug #57603 (project octave):

Repost comment #0, as Savannah messed up the format.

[comment #0 original submission:]
> Tested with version 4.2.2 under Ubuntu 18.04LTS and version 3.8.2 under
Centos 7:
> examples are 
> 
> quadv(@(t)sin(t).^2,0,8*pi)
> 
> which gives 8.0412e-30 whereas 
> 
> quadv(@(t)sin(t).^2,0,10*pi)
> 
> gives 15.708
> Another example is 
> 
> quadv(@(t)cos(t).^2,0.5*pi,8.5*pi)
> 
> which gives 2.2364e-29 instead of 12.566, the result obtained by quad or
quadgk.

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