[NumPy-Tickets] [NumPy] #2154: numpy.dot(a, b, a) gives an incorrect result for a

NumPy Trac numpy-tickets@scipy....
Thu Jun 7 21:29:20 CDT 2012


#2154: numpy.dot(a, b, a) gives an incorrect result for a
------------------------+---------------------------------------------------
 Reporter:  ktdrv       |       Owner:  somebody   
     Type:  defect      |      Status:  new        
 Priority:  normal      |   Milestone:  Unscheduled
Component:  numpy.core  |     Version:  1.6.1      
 Keywords:              |  
------------------------+---------------------------------------------------
 Unless this is expected but undocumented behavior, trying to dot product
 an array in-place, results in a broken result:


 {{{
 >>> a = arange(1, 10, dtype = float64).reshape(3, 3)
 >>> a
 array([[ 1.,  2.,  3.],
        [ 4.,  5.,  6.],
        [ 7.,  8.,  9.]])
 >>> dot(a, identity(3), a)
 array([[ 0.,  2.,  3.],
        [ 4.,  5.,  6.],
        [ 7.,  8.,  9.]])
 }}}

-- 
Ticket URL: <http://projects.scipy.org/numpy/ticket/2154>
NumPy <http://projects.scipy.org/numpy>
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