[Scipy-tickets] [SciPy] #292: Sparse/dense matrix vector multiplication

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Sat Jan 6 03:42:17 CST 2007


#292: Sparse/dense matrix vector multiplication
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 Reporter:  nils          |        Owner:  somebody
     Type:  defect        |       Status:  new     
 Priority:  normal        |    Milestone:          
Component:  scipy.sparse  |      Version:  devel   
 Severity:  normal        |   Resolution:          
 Keywords:                |  
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Comment (by wnbell):

 With the current version of sparsetools I get a residual of
 6.3361343105e-07.  Given that the nonzero numbers in the matrix range from
 ~3E3 to ~2E9 I think this difference can be attributed to differences in
 the order of summation.  When I replace the nonzeros in the matrix with
 random values, I get a residual on the order of machine epsilon.

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Ticket URL: <http://projects.scipy.org/scipy/scipy/ticket/292#comment:1>
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