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[Octave-bug-tracker] [bug #39573] Wrong result from eigs in generalized


From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #39573] Wrong result from eigs in generalized shift-invert mode
Date: Thu, 16 Mar 2017 05:52:07 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

Follow-up Comment #6, bug #39573 (project octave):

Taking the input matrices from #50546, you see that Octave gives 


error: __eigs__: eigs: error -9999 in dsaupd


for the fourth case (shift-invert mode). With the modifications described in
comment #1, I get


error = 7.6926e-13


If there are no additional comments, I will make a patch.

(file #40014)
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Additional Item Attachment:

File name: eigenvalues.m                  Size:10 KB


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