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[Octave-bug-tracker] [bug #32121] logm returns complex numbers


From: Gunnar Farnebäck
Subject: [Octave-bug-tracker] [bug #32121] logm returns complex numbers
Date: Tue, 01 Feb 2011 20:14:41 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20110107 Iceweasel/3.5.16 (like Firefox/3.5.16)

Follow-up Comment #2, bug #32121 (project octave):

Actually no threshold is needed in this specific case. A real matrix without
non-positive real eigenvalues always has a real logarithm, and as far as I can
tell the employed algorithm does find the real solution, so any imaginary
parts should be due to numerical imprecision and can be thrown away.


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