Re: [Boost-bugs] [Boost C++ Libraries] #9183: quantile for poisson distribution - precision issue?

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9183: quantile for poisson distribution - precision issue?
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-10-03 16:03:02

#9183: quantile for poisson distribution - precision issue?
-------------------------------+-------------------------
  Reporter:  tan@…             |      Owner:  johnmaddock
      Type:  Support Requests  |     Status:  new
 Milestone:  To Be Determined  |  Component:  math
   Version:  Boost 1.54.0      |   Severity:  Showstopper
Resolution:                    |   Keywords:
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Comment (by anonymous):

 >By "in the general case", do you mean when x (in the example above) is
 real, or that the "round trip" is also "bad" even when x is integral? Only
 the latter case is important to us.

 When x is integral and large there may be multiple (all integral) values
 of x which all yield the same cdf, this usually occurs when the cdf is a
 couple of epsilon less than 1, but I found a few cases for very small cdf
 values as well.  There's nothing that can be done about those cases -
 other than moving to a type with more precision, or, in the case where the
 cdf is near one, using complements instead.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9183#comment:4>
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