[Scipy-tickets] [SciPy] #1208: LOBPCG produces incorrect results

SciPy Trac scipy-tickets@scipy....
Sat Dec 11 19:07:58 CST 2010


#1208: LOBPCG produces incorrect results
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  Reporter:  bemasc               |       Owner:  wnbell
      Type:  defect               |      Status:  closed
  Priority:  normal               |   Milestone:  0.9.0 
 Component:  scipy.sparse.linalg  |     Version:  0.7.0 
Resolution:  duplicate            |    Keywords:        
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Changes (by pv):

  * status:  new => closed
  * resolution:  => duplicate


Comment:

 This is the same problem as #1304, which was fixed in r6835

 {{{
 ...
 iteration 1174
 final eigenvalue: [ 0.50434824  0.66425669  0.86242622  1.0581144 ]
 final residual norms: [  2.00691932e-05   2.52561151e-05   2.38814255e-05
 9.34494879e-05]
 Eigenvector 0 has norm 0.999999, claimed eigenvalue 0.504348, measured
 eigenvalue 0.504349, and inner product 1.
 Eigenvector 1 has norm 1, claimed eigenvalue 0.664257, measured eigenvalue
 0.664257, and inner product 1.
 Eigenvector 2 has norm 0.999999, claimed eigenvalue 0.862426, measured
 eigenvalue 0.862429, and inner product 1.
 Eigenvector 3 has norm 1, claimed eigenvalue 1.05811, measured eigenvalue
 1.05811, and inner product 1.
 }}}

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1208#comment:2>
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