[Boost-bugs] [Boost C++ Libraries] #7779: uniform_on_sphere returns -nan after many correct realizations when using single-precision floats

Subject: [Boost-bugs] [Boost C++ Libraries] #7779: uniform_on_sphere returns -nan after many correct realizations when using single-precision floats
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-10 08:14:11

#7779: uniform_on_sphere returns -nan after many correct realizations when using
single-precision floats
--------------------------------------------------+-------------------------
 Reporter:  Robert Gantner <rngantner@…>          |       Owner:  no-maintainer
     Type:  Bugs                                  |      Status:  new          
Milestone:  To Be Determined                      |   Component:  random       
  Version:  Boost 1.51.0                          |    Severity:  Problem      
 Keywords:                                        |  
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 When simulating random vectors using the boost::uniform_on_sphere
 distribution with single-precision floating-point numbers, certain
 realizations are a vector of -nan. For the seed used in the included
 program, this happens at realization 3802480. The realizations before and
 after the wrong one are correct (i.e. lie on the unit circle).

 I have only found this to happen in two dimensions, although it happens
 for many different seed values. I have not encountered the problem when
 using doubles.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/7779>
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