Re: [Boost-bugs] [Boost C++ Libraries] #7779: uniform_on_sphere returns nan in certain (rare) cases

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7779: uniform_on_sphere returns nan in certain (rare) cases
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-02-14 22:37:32

#7779: uniform_on_sphere returns nan in certain (rare) cases
---------------------------------------------------+------------------------
  Reporter:  Robert Gantner <rngantner@…>          |       Owner:  no-maintainer            
      Type:  Bugs                                  |      Status:  new                      
 Milestone:  To Be Determined                      |   Component:  random                   
   Version:  Boost 1.46.1                          |    Severity:  Problem                  
Resolution:                                        |    Keywords:  uniform_on_sphere, random
---------------------------------------------------+------------------------

Comment (by steven_watanabe):

 Actually it doesn't matter if sqsum is close to zero.  As long as it isn't
 zero, there is no problem.  (I suppose if sqsum were denormalized, it
 could be a problem, but normal_distribution doesn't produce denormalized
 numbers.  I'm just going to add a test for zero.  This shouldn't affect
 the performance in any noticeable way, since generating normal variates
 and dividing is much more expensive than a branch that is almost never
 taken.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7779#comment:4>
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