Re: [Boost-bugs] [Boost C++ Libraries] #4812: Bug in boost::math::special_functions::sign showing up in special_functions::bessel_jy()

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4812: Bug in boost::math::special_functions::sign showing up in special_functions::bessel_jy()
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-11-05 12:03:02

#4812: Bug in boost::math::special_functions::sign showing up in
special_functions::bessel_jy()
----------------------------------------------+-----------------------------
  Reporter:  peter zwart <PHZwart@…>          |       Owner:  johnmaddock                     
      Type:  Bugs                             |      Status:  new                             
 Milestone:  To Be Determined                 |   Component:  math                            
   Version:  Boost 1.45.0                     |    Severity:  Showstopper                     
Resolution:                                   |    Keywords:  sign sph_bessel special_function
----------------------------------------------+-----------------------------

Comment (by anonymous):

 Thanks for the info,

 So am I correct in thinking that (std::signbit)(-1.24911e-2468L) returns
 0?  If so can you please file a bug report with the GNU libc guys?

 The fix will be to define BOOST_MATH_DISABLE_STD_FPCLASSIFY for those
 platforms that are effected... if we can figure out which those are.  In
 the mean time I'll update our regression tests with this case and see what
 fails...

 Regards, John Maddock.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4812#comment:3>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.