[Numpy-tickets] [NumPy] #1008: Loss of precision in (complex) arcsinh & arctanh

NumPy numpy-tickets@scipy....
Sun Feb 15 06:22:59 CST 2009


#1008: Loss of precision in (complex) arcsinh & arctanh
---------------------------------------+------------------------------------
 Reporter:  pv                         |        Owner:  somebody
     Type:  defect                     |       Status:  new     
 Priority:  normal                     |    Milestone:  1.3.0   
Component:  numpy.core                 |      Version:  devel   
 Severity:  minor                      |   Resolution:          
 Keywords:  precision arcsinh arctanh  |  
---------------------------------------+------------------------------------
Comment (by pv):

 Correction: also `arcsin` and `arctan` suffer from the same loss of
 precision:
 {{{
 >>> np.arcsin(1e-50j)
 -0j
 >>> np.arctan(1e-50j)
 0j
 }}}

-- 
Ticket URL: <http://scipy.org/scipy/numpy/ticket/1008#comment:1>
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