[NumPy-Tickets] [NumPy] #896: Geometric, negative binomial and poisson fail for extreme arguments

[NumPy Trac]

#896: Geometric, negative binomial and poisson fail for extreme arguments
--------------------------+-------------------------------------------------
 Reporter:  anand         |       Owner:  rkern         
     Type:  defect        |      Status:  needs_decision
 Priority:  normal        |   Milestone:  Unscheduled   
Component:  numpy.random  |     Version:  devel         
 Keywords:                |  
--------------------------+-------------------------------------------------
Changes (by mwiebe):

  * version:  none => devel
  * milestone:  2.0.0 => Unscheduled


Comment:

 Except for poisson, it's still basically the same (but LONGLONG_MIN
 instead on a 64-bit system):

 {{{
 In [64]: numpy.random.geometric(p)
 Out[64]: -9223372036854775808

 In [65]: numpy.random.poisson((1-p)/p)
 ---------------------------------------------------------------------------
 ValueError                                Traceback (most recent call
 last)

 /home/mwiebe/<ipython console> in <module>()

 /home/mwiebe/installtest/lib64/python2.7/site-
 packages/numpy/random/mtrand.so in mtrand.RandomState.poisson
 (numpy/random/mtrand/mtrand.c:14605)()

 ValueError: lam value too large

 In [66]: numpy.random.negative_binomial(1,p)
 Out[66]: -9223372036854775808
 }}}

-- 
Ticket URL: <http://projects.scipy.org/numpy/ticket/896#comment:12>
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