author | Balazs Dezso <deba@google.com> |
Thu, 08 Aug 2013 22:56:10 +0200 | |
changeset 986 | 552e3d1242c6 |
parent 470 | 81627fa1b007 |
child 877 | 141f9c0db4a3 |
permissions | -rw-r--r-- |
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/* -*- mode: C++; indent-tabs-mode: nil; -*- |
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* |
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* This file is a part of LEMON, a generic C++ optimization library. |
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* |
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* Copyright (C) 2003-2009 |
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* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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* (Egervary Research Group on Combinatorial Optimization, EGRES). |
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* |
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* Permission to use, modify and distribute this software is granted |
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* provided that this copyright notice appears in all copies. For |
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* precise terms see the accompanying LICENSE file. |
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* |
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* This software is provided "AS IS" with no warranty of any kind, |
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* express or implied, and with no claim as to its suitability for any |
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* purpose. |
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* |
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*/ |
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|
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#ifndef LEMON_MATH_H |
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#define LEMON_MATH_H |
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|
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///\ingroup misc |
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///\file |
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///\brief Some extensions to the standard \c cmath library. |
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/// |
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///Some extensions to the standard \c cmath library. |
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/// |
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///This file includes the standard math library (cmath). |
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|
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#include<cmath> |
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|
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namespace lemon { |
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|
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/// \addtogroup misc |
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/// @{ |
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|
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/// The Euler constant |
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const long double E = 2.7182818284590452353602874713526625L; |
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/// log_2(e) |
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const long double LOG2E = 1.4426950408889634073599246810018921L; |
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/// log_10(e) |
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const long double LOG10E = 0.4342944819032518276511289189166051L; |
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/// ln(2) |
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const long double LN2 = 0.6931471805599453094172321214581766L; |
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/// ln(10) |
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const long double LN10 = 2.3025850929940456840179914546843642L; |
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/// pi |
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const long double PI = 3.1415926535897932384626433832795029L; |
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/// pi/2 |
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const long double PI_2 = 1.5707963267948966192313216916397514L; |
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/// pi/4 |
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const long double PI_4 = 0.7853981633974483096156608458198757L; |
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/// sqrt(2) |
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const long double SQRT2 = 1.4142135623730950488016887242096981L; |
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/// 1/sqrt(2) |
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const long double SQRT1_2 = 0.7071067811865475244008443621048490L; |
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|
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///Check whether the parameter is NaN or not |
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|
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///This function checks whether the parameter is NaN or not. |
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///Is should be equivalent with std::isnan(), but it is not |
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///provided by all compilers. |
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inline bool isNaN(double v) |
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{ |
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return v!=v; |
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} |
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|
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/// @} |
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|
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} //namespace lemon |
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|
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#endif //LEMON_TOLERANCE_H |