[Numpy-tickets] [NumPy] #638: var should take absolute value for complex numbers.

NumPy numpy-tickets@scipy....
Sun Dec 30 01:04:35 CST 2007


#638: var should take absolute value for complex numbers.
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 Reporter:  akumar       |        Owner:  somebody
     Type:  defect       |       Status:  new     
 Priority:  normal       |    Milestone:  1.0.5   
Component:  numpy.core   |      Version:  none    
 Severity:  normal       |   Resolution:          
 Keywords:  var complex  |  
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Comment (by rkern):

 Can you point me to a reference defining the variance over complex numbers
 in the way you think it is? Near as I can tell, the only meaningful
 definition is the one implemented: treating complex numbers as 2-vectors
 with the variance being computed over each dimension independently. The
 formula you give is indeed valid for real numbers, but it does not make
 sense to extend it to complex numbers without change.

-- 
Ticket URL: <http://scipy.org/scipy/numpy/ticket/638#comment:2>
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