[Boost-bugs] [Boost C++ Libraries] #5703: geometric_distribution::min() returns wrong value

Subject: [Boost-bugs] [Boost C++ Libraries] #5703: geometric_distribution::min() returns wrong value
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-07-17 05:23:02

#5703: geometric_distribution::min() returns wrong value
------------------------------+---------------------------------------------
 Reporter:  anonymous         |       Owner:  no-maintainer
     Type:  Bugs              |      Status:  new          
Milestone:  To Be Determined  |   Component:  random       
  Version:  Boost 1.47.0      |    Severity:  Problem      
 Keywords:                    |  
------------------------------+---------------------------------------------
 geometric_distribution::min() returns always 1. (boost 1.47)

 I think, this is a wrong value.

 Should return 0.


 In fact, boost::random::geometric_distribution::operator()(Engine) is
 sometimes returns 0.


 The boost::random::geometric_distribution class has been updated to match
 the C++ standard.

 Boost 1.46.1 : p(i) = (1-p)p^(i-1)^

 Boost 1.47   : p(i) = p(1-p)^i^


 If the previous specification, then it should return 1.

 However, the current specification, should return 0.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5703>
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