[Boost-bugs] [Boost C++ Libraries] #6893: Inaccurate Radians/Degrees conversion

Subject: [Boost-bugs] [Boost C++ Libraries] #6893: Inaccurate Radians/Degrees conversion
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-05-13 10:19:17

#6893: Inaccurate Radians/Degrees conversion
---------------------------------+------------------------------------------
 Reporter:  pieterb@…            |       Owner:  matthiasschabel
     Type:  Bugs                 |      Status:  new            
Milestone:  To Be Determined     |   Component:  units          
  Version:  Boost 1.49.0         |    Severity:  Problem        
 Keywords:                       |  
---------------------------------+------------------------------------------
 LS,

 The conversion from angles in degrees to radians currently uses a
 conversion factor of  6.28318530718/360. (File:
 boost\units\base_units\angle\degree.hpp), which equals
 0.0174532925199444444...

 This is unnecessarily inaccurate (only 14 significant digits are correct)
 and gives problems in my application - the actual value reads:
 0.017453292519943295769236907684886127134428718885417...

 Using this value improves conversion accuracy significantly.

 Please consider using this more accurate value. Alternatively, the use of
 boost::math::constants could be considered, making the factor:
 boost::math::constants::pi<double>()/180.0
 which works fine as well.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6893>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.