Re: [Boost-bugs] [Boost C++ Libraries] #5385: atanh.hpp returns wrong limits for atanh(1)

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5385: atanh.hpp returns wrong limits for atanh(1)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-03-29 11:01:25

#5385: atanh.hpp returns wrong limits for atanh(1)
---------------------------------+------------------------------------------
  Reporter:  florian@…           |       Owner:  johnmaddock
      Type:  Bugs                |      Status:  new        
 Milestone:  To Be Determined    |   Component:  math       
   Version:  Boost 1.46.0        |    Severity:  Showstopper
Resolution:                      |    Keywords:             
---------------------------------+------------------------------------------

Comment (by florian@…):

 Sorry, I screwed up the formatting:

 The original source code in boost/math/special_functions/atanh.hpp
 {{{
 59: else if(x < -1 + tools::epsilon<T>())
 60: {
 61:    // -Infinity:
 62:    return -policies::raise_overflow_error<T>(function, 0, pol);
 63: }
 64: else if(x > 1 - tools::epsilon<T>())
 65: {
 66:    // Infinity:
 67:    return -policies::raise_overflow_error<T>(function, 0, pol);
 68: }
 }}}
 should be changed to
 {{{
 66:    // Infinity:
 67:    return policies::raise_overflow_error<T>(function, 0, pol);
 }}}
 where in line 67 the minus sign was removed to return +Infinity if the
 overflow error is ignored.

 /Florian

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5385#comment:1>
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