[Numpy-discussion] linalg.eigenvector hang on nan values

Chris Fonnesbeck fonnesbeck at gmail.com
Wed Mar 22 15:56:07 CST 2006


If linalg.eigenvectors is called on a matrix that contains nan values, it
hangs, quickly consuming system resources. Here is the matrix:

matrix = [[ 0.          0.          0.          0.          0.36658624
0.          0.
   0.          0.          0.        ]
 [ 0.89827259  0.          0.          0.          0.          0.
0.
   0.          0.          0.        ]
 [ 0.          0.92510948  0.          0.          0.          0.
0.
   0.          0.          0.        ]
 [ 0.          0.                 nan         nan  0.          0.
0.
   0.          0.          0.        ]
 [ 0.          0.                 nan         nan  0.                 nan
   0.          0.          0.          0.        ]
 [ 0.          0.          0.          0.          0.93319244         nan
   0.          0.          0.          0.        ]
 [ 0.          0.          0.          0.          0.36658624  0.
0.
   0.          0.          0.        ]
 [ 0.          0.          0.          0.          0.          0.
   0.89827259  0.          0.          0.        ]
 [ 0.          0.          0.          0.          0.          0.
0.
   0.92510948  0.          0.        ]
 [ 0.          0.          0.          0.          0.          0.
0.
   0.          0.92510948  0.93319244]]

I would expect an exception, but I get none.

Using a recent cvs build of numpy.

C.

--
Chris Fonnesbeck + Atlanta, GA + http://trichech.us
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