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

NumPy numpy-tickets at scipy.net
Mon Jan 8 11:22:07 CST 2007


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

 What is happening is that instead of subtracting the new number from the
 previous result, the previous result is being subtracted from the new
 number. So you start with 0, and the sequence of operations continues:

 0 = 0 - 0
 1 = 1 - 0
 1 = 2 - 1
 2 = 3 - 1
 2 = 4 - 2
 3 = 5 - 2

-- 
Ticket URL: <http://projects.scipy.org/scipy/numpy/ticket/413#comment:1>
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