[SciPy-user] Severe problems with linalg.eigvals

Nils Wagner nwagner at mecha.uni-stuttgart.de
Thu Jul 8 07:07:59 CDT 2004


Dear experts,

I am going to solve nonlinear eigenvalue problems by a brute force 
approach (see the attachement). However I get into difficulties using 
linalg.eigvals

Traceback (most recent call last):
   File "brute.py", line 39, in ?
     w = linalg.eigvals(A,B)
   File "/usr/lib/python2.3/site-packages/scipy/linalg/decomp.py", line 
161, in eigvals
     return eig(a,b=b,left=0,right=0,overwrite_a=overwrite_a)
   File "/usr/lib/python2.3/site-packages/scipy/linalg/decomp.py", line 
109, in eig
     return _geneig(a1,b,left,right,overwrite_a,overwrite_b)
   File "/usr/lib/python2.3/site-packages/scipy/linalg/decomp.py", line 
60, in _geneig
     if info>0: raise LinAlgError,"generalized eig algorithm did not 
converge"
scipy.linalg.basic.LinAlgError: generalized eig algorithm did not converge

How can I get rid of this problem ?

Any pointer would be appreciated.

Thanks in advance

                             Nils
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