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[Octave-bug-tracker] [bug #31479] Crash & bugs in eigs

From: John W. Eaton
Subject: [Octave-bug-tracker] [bug #31479] Crash & bugs in eigs
Date: Fri, 28 Jan 2011 19:33:55 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110107 Iceweasel/3.5.16 (like Firefox/3.5.16)

Follow-up Comment #12, bug #31479 (project octave):

I've checked in the changes.  Unfortunately, just after checking them in, I
noticed that I'm sometimes getting this:

A = [1,0,0,-1;0,1,0,0;0,0,1,0;0,0,2,1]; [vecs,vals,f] = eigs(A,1)
vecs =


vals =  1.0000e+00 + 3.4557e-06i
f = 0
error: eigs: error -8 in dneupd

This is quite odd, as I thought I was using the same sources for ARPACK as
the debian package, which is what I was using before.  I'll try to debug

The comments in dneupd say that error -8 is

Error return from calculation of a real Schur form.
Informational error from LAPACK routine dlahqr



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