[Scipy-tickets] [SciPy] #567: Severe nan bug in stats.norm.cdf

SciPy scipy-tickets@scipy....
Mon Dec 17 22:43:45 CST 2007


#567: Severe nan bug in stats.norm.cdf
-------------------------+--------------------------------------------------
 Reporter:  cems         |       Owner:  somebody                
     Type:  defect       |      Status:  new                     
 Priority:  normal       |   Milestone:  Statistics Review Months
Component:  scipy.stats  |     Version:  0.5.2                   
 Severity:  major        |    Keywords:                          
-------------------------+--------------------------------------------------
 Reproducible bug.

 version 0.5.2.1-2   from fink
 running in ipython, mac ppc G4, 10.4.11

 description: at many special input values stats.norm.cdf() returns a nan.

 Example:

 In [308]: stats.norm.cdf(-1.7624320981)
 Out[308]: array(0.03899815972020125)

 In [309]: stats.norm.cdf(-1.7624320982)
 Out[309]: array(nan)

 In [310]: stats.norm.cdf(-1.7624320983)
 Out[310]: array(nan)

 In [311]: stats.norm.cdf(-1.7624320984)
 Out[311]: array(0.038998159694008439)

-- 
Ticket URL: <http://scipy.org/scipy/scipy/ticket/567>
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