[Octave-bug-tracker] [bug #47236] output of eigs() with 'sa' option differs from Matlab

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?47236>

                 Summary: output of eigs() with 'sa' option differs from
Matlab
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 23 Feb 2016 03:14:27 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Oliver Sampson
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.2
        Operating System: GNU/Linux

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Details:

When going through the examples contained in this document:
http://www.cs.yale.edu/homes/spielman/561/lect01-15.pdf and in particular
towards the end with the dodecahedron example, the output from Octave differs
significantly from that of Matlab. In particular, the "sa" option for eigs()
forces an ordering on the ouput eigenvalues/vectors which doesn't seem to be
observed. When following through the example, the output is signficantly
different.

I conferred with others on the IRC channel, and they confirmed that the bug is
also in 4.0.




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