[Numpy-tickets] [NumPy] #551: numpy.ndarray messed up after unpickling

NumPy numpy-tickets@scipy....
Mon Jul 16 17:01:11 CDT 2007

#551: numpy.ndarray messed up after unpickling
 Reporter:  cotackst    |       Owner:  somebody                 
     Type:  defect      |      Status:  new                      
 Priority:  normal      |   Milestone:                           
Component:  numpy.core  |     Version:  1.0.1                    
 Severity:  normal      |    Keywords:  pickle, ndarray, segfault
 After unpickling a pickled numpy.ndarray matrix (using cPickle), I get a
 segmentation fault when trying to multiply the matrix by a vector. However
 I can multiply a copy of the matrix with the same vector.

 The code to generate the actual matrix is quite large, so I only attach
 the pickled matrix ('mat.bug').

 Reproducing code:[[BR]]
 from cPickle import Unpickler[[BR]]
 from numpy import ones, dot[[BR]]

 bug_mat = Unpickler(file('mat.bug','r')).load()[[BR]]
 ok_mat = bug_mat.copy()[[BR]]
 v = ones((1,bug_mat.shape[0]))[[BR]]
 dot(v,ok_mat) # this works[[BR]]
 dot(v,bug_mat) # this segfault[[BR]]

Ticket URL: <http://projects.scipy.org/scipy/numpy/ticket/551>
NumPy <http://projects.scipy.org/scipy/numpy>
The fundamental package needed for scientific computing with Python.

More information about the Numpy-tickets mailing list