[Scipy-tickets] [SciPy] #299: gammaincinv gives incorrect answers

SciPy scipy-tickets@scipy....
Fri Nov 2 10:59:52 CDT 2007


#299: gammaincinv gives incorrect answers
---------------------------+------------------------------------------------
 Reporter:  djcmackay      |        Owner:  cookedm 
     Type:  defect         |       Status:  assigned
 Priority:  normal         |    Milestone:  0.7     
Component:  scipy.special  |      Version:          
 Severity:  normal         |   Resolution:          
 Keywords:  gammainc       |  
---------------------------+------------------------------------------------
Comment (by cookedm):

 `gammaincinv(a, y)` is computed as `gammainccinv(a, 1-y)`, so if `y` is
 small enough that `1 == 1-y` you'll get 0. Getting around this means
 implementing `gammaincinv` for values of `y` near 0.

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Ticket URL: <http://scipy.org/scipy/scipy/ticket/299#comment:3>
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