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[Octave-bug-tracker] [bug #41305] error: eigs: error -14 in dneupd


From: anonymous
Subject: [Octave-bug-tracker] [bug #41305] error: eigs: error -14 in dneupd
Date: Wed, 22 Jan 2014 14:16:49 +0000
User-agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/31.0.1650.63 Chrome/31.0.1650.63 Safari/537.36

URL:
  <http://savannah.gnu.org/bugs/?41305>

                 Summary: error: eigs: error -14 in dneupd
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mi 22 Jan 2014 14:16:49 UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: Max
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: GNU/Linux

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Details:

I'm using GNU Octave for research and need to randomly initialise matrices and
then calculate their eigenvalues. Sometimes I get the following error

error: eigs: error -14 in dneupd


In Version 3.4.2 and 3.6.4 the following line triggers the error:

rand('state',114); W = rand(200); W(W < 0.9) = 0; W(W != 0) = rand(size(W(W !=
0))) - 0.5; eigs(W,1)


The following line triggers the error only in version 3.4.2:

rand('state',137); W = rand(200); W(W < 0.9) = 0; W(W != 0) = rand(size(W(W !=
0))) - 0.5; eigs(W,1)


Please note that calling  eigs(W) , leaving away the >>1<<, works correctly.

If eigs works correctly, the error should occur in both versions and the error
message should be more informative.
I think, something has to be done to fix eigs or its librarys.

sincerely




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?41305>

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  Nachricht gesendet von/durch Savannah
  http://savannah.gnu.org/




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