[SciPy-user] Trouble with linsolve

Nils Wagner nwagner at iam.uni-stuttgart.de
Wed Nov 29 03:38:02 CST 2006


Robert Cimrman wrote:
> Nils Wagner wrote:
>   
>> With UMFPACK 4.4 and a dense RHS I get
>>
>>     x = spsolve(K_dyn, f)
>>   File "/usr/lib64/python2.4/site-packages/scipy/linsolve/linsolve.py",
>> line 65, in spsolve
>>     return umf.linsolve( umfpack.UMFPACK_A, mat, b, autoTranspose = True )
>>   File
>> "/usr/lib64/python2.4/site-packages/scipy/linsolve/umfpack/umfpack.py",
>> line 566, in linsolve
>>     sol = self.solve( sys, mtx, rhs, autoTranspose )
>>   File
>> "/usr/lib64/python2.4/site-packages/scipy/linsolve/umfpack/umfpack.py",
>> line 508, in solve
>>     self._numeric, self.control, self.info )
>>   File
>> "/usr/lib64/python2.4/site-packages/scipy/linsolve/umfpack/_umfpack.py",
>> line 214, in umfpack_di_solve
>>     return __umfpack.umfpack_di_solve(*args)
>> ValueError: object too deep for desired array
>>     
>>>>> K_dyn
>>>>>           
>> <71987x71987 sparse matrix of type '<type 'numpy.float64'>'
>>         with 3083884 stored elements (space for 3083884)
>>         in Compressed Sparse Column format>
>>
>> Any idea ?
>>     
>
> I use umfpack on a 32 bit system regularly without problems, so it may 
> be a 64-bit issue. I have yet to set up a 64-bit installation of scipy 
> to test it, though, so I cannot tell you more immediately.
>
> Did you also check your inputs to spsolve?
>
> r.
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> SciPy-user at scipy.org
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>   
Robert,

Just now I have filed two tickets. I hope someone can reproduce my results.

http://projects.scipy.org/scipy/scipy/ticket/318
http://projects.scipy.org/scipy/scipy/ticket/319

I have tried SuperLU on 32 and 64 bit machines - the segfault persists.
I have installed UMFPACK on a 64 bit machine.

Any pointer would be appreciated.

Thanks in advance.

Nils

 


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