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[Octave-bug-tracker] [bug #51867] Warning in quadgk with zero size inter


From: David Bateman
Subject: [Octave-bug-tracker] [bug #51867] Warning in quadgk with zero size interval
Date: Tue, 29 Aug 2017 10:26:11 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0

Follow-up Comment #4, bug #51867 (project octave):

A reference to the Shampine paper is



L.F. Shampine, Vectorized adaptive quadrature in Matlab, Journal of
Computational and Applied Mathematics, Volume 211, Issue 2, 2008, Pages
131-140, ISSN 0377-0427, http://dx.doi.org/10.1016/j.cam.2006.11.021.
(http://www.sciencedirect.com/science/article/pii/S037704270600700X)
Keywords: Global adaptive quadrature; Infinite interval; End point
singularity; Piecewise-smooth integrand


though its behind a paywall. The relavant text in this article is


"A computational distinction is that if reltol is positive, then rtol =
max(reltol,100*eps), where eps is the unit roundoff in MATLAB. This prevents
the code from attempting an accuracy unreasonable in the precision
available."


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