[Scipy-tickets] [SciPy] #1456: scipy.sparse.linalg.lobpcg fails for large sparse matrices

SciPy Trac scipy-tickets@scipy....
Wed Jun 8 13:27:22 CDT 2011


#1456: scipy.sparse.linalg.lobpcg fails for large sparse matrices
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 Reporter:  AndrewMacLean        |       Owner:  wnbell
     Type:  defect               |      Status:  new   
 Priority:  normal               |   Milestone:        
Component:  scipy.sparse.linalg  |     Version:  0.7.2 
 Keywords:                       |  
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Comment(by pv):

 Either it is an issue with the LOBPCG algorithm, or an issue with the
 implementation. If it's an issue with the algorithm, then it is not a bug.

 Do you have a reason to expect that the algorithm works for this case at
 some given speed? Is the convergence slower than what it should be for
 LOBPCG? I'm not an expert on LOBPCG, but it does not seem unusual that
 eigenvalue computations of matrices of that size could fail.

 The Google docs links do not seem to work -- it just asks for a Google
 login, and if logged in, says that the pages are not available.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1456#comment:1>
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