[Numpy-tickets] [NumPy] #959: atanh(+1) gives nan instead of inf on Windows

NumPy numpy-tickets@scipy....
Wed Nov 26 11:39:17 CST 2008


#959: atanh(+1) gives nan instead of inf on Windows
------------------------+---------------------------------------------------
 Reporter:  faltet      |        Owner:  somebody
     Type:  defect      |       Status:  new     
 Priority:  normal      |    Milestone:  1.3.0   
Component:  numpy.core  |      Version:  devel   
 Severity:  normal      |   Resolution:          
 Keywords:              |  
------------------------+---------------------------------------------------
Comment (by charris):

 The function didn't change but the configuration changes for detecting
 functions probably caused the numpy version to be used. What happens if
 you add

 #define HAVE_ATANH

 before the function? In any case we need to track down the problem. The
 numpy version is more accurate for small values of x than the Mathworks
 version, but I suspect log1p might be broken for inf values. What does
 log1p(inf) do?

-- 
Ticket URL: <http://scipy.org/scipy/numpy/ticket/959#comment:2>
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