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From Dimitri Pourbaix <>
Subject [MATH] Comment on MATH-352
Date Wed, 10 Mar 2010 16:04:25 GMT

I looked at the suggestion related to MATH-352 regarding the robustness of
the determination of the rank of the Jacobian in Levenberg-Marquardt.  It
does make sense indeed to replace ak2 == 0 with something more robust like
ak2<= treshold.  However, if one uses the epsilon machine for the threshold
as suggested, several tests in LevenbergMarquardtOptimizerTest and
MinipackTest fail.  Strange, is not it: usually it goes in the other way
round, when one becomes less strict, fewer tests fail.  Here, it is the

Should one reassess some of these unit tests?

Dimitri Pourbaix                         *
Institut d'Astronomie et d'Astrophysique *      Don't worry, be happy
CP 226, office 2.N4.211, building NO     *         and CARPE DIEM.
Universite Libre de Bruxelles            *
Boulevard du Triomphe                    *      Tel : +32-2-650.35.71
  B-1050 Bruxelles                        *      Fax : +32-2-650.42.26     *

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