| 1 | /*
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| 2 | * vmg - a versatile multigrid solver
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| 3 | * Copyright (C) 2012 Institute for Numerical Simulation, University of Bonn
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| 4 | *
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| 5 | * vmg is free software: you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation, either version 3 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * vmg is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 |
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| 19 | /**
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| 20 | * @file math.hpp
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| 21 | *
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| 22 | * @author Julian Iseringhausen
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| 23 | *
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| 24 | * @brief Mathematical constants
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| 25 | *
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| 26 | */
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| 27 |
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| 28 | #ifndef MATH_HPP_
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| 29 | #define MATH_HPP_
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| 30 |
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| 31 | namespace VMG
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| 32 | {
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| 33 |
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| 34 | namespace Math
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| 35 | {
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| 36 |
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| 37 | const double e = 2.7182818284590452354; /* e */
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| 38 | const double log2e = 1.4426950408889634074; /* log_2 e */
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| 39 | const double log10e = 0.43429448190325182765; /* log_10 e */
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| 40 | const double ln2 = 0.69314718055994530942; /* log_e 2 */
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| 41 | const double ln10 = 2.30258509299404568402; /* log_e 10 */
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| 42 | const double pi = 3.14159265358979323846; /* pi */
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| 43 | const double pi_2 = 1.57079632679489661923; /* pi/2 */
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| 44 | const double pi_4 = 0.78539816339744830962; /* pi/4 */
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| 45 | const double pi_inv = 0.31830988618379067154; /* 1/pi */
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| 46 | const double pi_2_inv = 0.63661977236758134308; /* 2/pi */
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| 47 | const double sqrtpi_2_inv = 1.12837916709551257390; /* 2/sqrt(pi) */
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| 48 | const double sqrt2 = 1.41421356237309504880; /* sqrt(2) */
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| 49 | const double sqrt2_inv = 0.70710678118654752440; /* 1/sqrt(2) */
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| 50 |
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| 51 | }
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| 52 |
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| 53 | }
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| 54 |
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| 55 | #endif /* MATH_HPP_ */
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