[Scipy-tickets] [SciPy] #1159: Use ARPACK to implement eigs? (wrong eigenvalues generated by linalg.eigh/DSYEVR)

SciPy Trac scipy-tickets@scipy....
Thu Apr 22 14:49:27 CDT 2010


#1159: Use ARPACK to implement eigs? (wrong eigenvalues generated by
linalg.eigh/DSYEVR)
------------------------------------------------+---------------------------
 Reporter:  ysr                                 |       Owner:  somebody
     Type:  defect                              |      Status:  reopened
 Priority:  normal                              |   Milestone:  0.8.0   
Component:  scipy.linalg                        |     Version:  0.7.0   
 Keywords:  eigenvalue, hermitian, eigenvector  |  
------------------------------------------------+---------------------------

Comment(by ysr):

 Interestingly, scipy.sparse.linalg.eigen.arpack.eigen gives similar
 issues, but scipy.sparse.linalg.eigen.arpack.eigen_symmetric seems to give
 the correct answers. Octave's eigs also has issues for this matrix when we
 compute the smallest eigenvectors. MATLAB seems to give the correct
 answers.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1159#comment:6>
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