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: 2013-09-30 18:14:49

#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):

 I'm not surprised that that doesn't work as you expected - as you said
 it's a rounding issue - the calculated cdf is necessarily an
 approximation, and if you then try to invert that the chances of getting
 exactly 66 (or some other integer) back are basically nil.  I guess we
 could check to see if the real-valued result is very near to an integer
 and then double check to see if that integer still fulfills the specified
 requirements, but I'm betting that might not work in this case either...

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9183#comment:1>
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