[Numpy-discussion] Problem with numpy.linalg.eig?

David Cournapeau david@ar.media.kyoto-u.ac...
Thu Nov 15 04:45:17 CST 2007


Michael McNeil Forbes wrote:
> On 13 Nov 2007, at 9:43 AM, Geoffrey Zhu wrote:
>   
>> On Nov 13, 2007 2:37 AM, David Cournapeau <david@ar.media.kyoto- 
>> u.ac.jp> wrote:
>>     
>>> Geoffrey Zhu wrote:
>>>       
>>>> Pointer problems are usually random...
>>>>         
> ...
>   
>> The original MSI version hangs on numpy.test() if I open IDLE and type
>>
>> import numpy
>> numpy.test()
>>
>> If I try the OP's test first, once it hang on "from numpy.linalg
>> import eig" and the other time it ran successfully. After it ran
>> successfully, it ran numpy.test() successfully, too.
>>
>> As you said, it is random.
>>     
>
>
> I have also been having random problems with the latest numpy from  
> svn built on an Intel core 2 Duo Linux box running in 64 bit mode  
> under Red Hat 3.4.6-8 with the gcc 3.4.6 20060404 and ATLAS 3.8.0.
>
> I am having a problem with numpy.linalg.eigh and complex Hermitian  
> matrices.  Randomly, I get seemingly correct answers, and then  
> eigenvectors full of Nan's (though not completely.  The first row the  
> the eigenvectors seem to be numbers, but incorrect.)
>   
Which fortran compiler are you using ?

David



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