[Numpy-tickets] [NumPy] #413: Reduction with noncommutative ufuncs is broken

NumPy numpy-tickets at scipy.net
Tue Jan 9 01:08:54 CST 2007

#413: Reduction with noncommutative ufuncs is broken
 Reporter:  rkern       |        Owner:  oliphant
     Type:  defect      |       Status:  closed  
 Priority:  high        |    Milestone:          
Component:  numpy.core  |      Version:  devel   
 Severity:  critical    |   Resolution:  fixed   
 Keywords:              |  
Changes (by oliphant):

  * status:  assigned => closed
  * resolution:  => fixed


 Ah.  A simple swap is all that was needed.  We just needed to also swap
 the striding values in loop->steps.

 Specifically all references of loop->bufptr[0] and loop->bufptr[1] where
 exchanged.  This exchange also occurred for all references of
 loop->steps[0] and loop->steps[1] in construct_reduce, PyArray_Reduce,
 PyArray_Accumulate, and PyArray_ReduceAt

 The change was incorporated in r3205

Ticket URL: <http://projects.scipy.org/scipy/numpy/ticket/413#comment:6>
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