1 /* -*- c++ -*- ---------------------------------------------------------- 2 LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator 3 https://www.lammps.org/, Sandia National Laboratories 4 Steve Plimpton, sjplimp@sandia.gov 5 6 Copyright (2003) Sandia Corporation. Under the terms of Contract 7 DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains 8 certain rights in this software. This software is distributed under 9 the GNU General Public License. 10 11 See the README file in the top-level LAMMPS directory. 12 ------------------------------------------------------------------------- */ 13 14 #ifndef LMP_MATH_CONST_H 15 #define LMP_MATH_CONST_H 16 17 namespace LAMMPS_NS { 18 19 namespace MathConst { 20 static constexpr double THIRD = 1.0 / 3.0; 21 static constexpr double TWOTHIRDS = 2.0 / 3.0; 22 static constexpr double MY_PI = 3.14159265358979323846; // pi 23 static constexpr double MY_2PI = 6.28318530717958647692; // 2pi 24 static constexpr double MY_3PI = 9.42477796076937971538; // 3pi 25 static constexpr double MY_4PI = 12.56637061435917295384; // 4pi 26 static constexpr double MY_PI2 = 1.57079632679489661923; // pi/2 27 static constexpr double MY_PI4 = 0.78539816339744830962; // pi/4 28 static constexpr double MY_PIS = 1.77245385090551602729; // sqrt(pi) 29 static constexpr double MY_ISPI4 = 1.12837916709551257389; // 1/sqrt(pi/4) 30 static constexpr double MY_SQRT2 = 1.41421356237309504880; // sqrt(2) 31 static constexpr double MY_CUBEROOT2 = 1.25992104989487316476; // 2*(1/3) 32 } // namespace MathConst 33 34 } // namespace LAMMPS_NS 35 36 #endif 37