1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library. |
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4 | * |
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5 | * Copyright (C) 2003-2010 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_MATH_H |
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20 | #define LEMON_MATH_H |
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21 | |
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22 | ///\ingroup misc |
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23 | ///\file |
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24 | ///\brief Some extensions to the standard \c cmath library. |
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25 | /// |
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26 | ///Some extensions to the standard \c cmath library. |
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27 | /// |
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28 | ///This file includes the standard math library (cmath). |
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29 | |
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30 | #include<cmath> |
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31 | |
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32 | namespace lemon { |
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33 | |
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34 | /// \addtogroup misc |
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35 | /// @{ |
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36 | |
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37 | /// The Euler constant |
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38 | const long double E = 2.7182818284590452353602874713526625L; |
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39 | /// log_2(e) |
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40 | const long double LOG2E = 1.4426950408889634073599246810018921L; |
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41 | /// log_10(e) |
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42 | const long double LOG10E = 0.4342944819032518276511289189166051L; |
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43 | /// ln(2) |
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44 | const long double LN2 = 0.6931471805599453094172321214581766L; |
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45 | /// ln(10) |
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46 | const long double LN10 = 2.3025850929940456840179914546843642L; |
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47 | /// pi |
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48 | const long double PI = 3.1415926535897932384626433832795029L; |
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49 | /// pi/2 |
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50 | const long double PI_2 = 1.5707963267948966192313216916397514L; |
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51 | /// pi/4 |
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52 | const long double PI_4 = 0.7853981633974483096156608458198757L; |
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53 | /// sqrt(2) |
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54 | const long double SQRT2 = 1.4142135623730950488016887242096981L; |
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55 | /// 1/sqrt(2) |
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56 | const long double SQRT1_2 = 0.7071067811865475244008443621048490L; |
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57 | |
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58 | ///Check whether the parameter is NaN or not |
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59 | |
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60 | ///This function checks whether the parameter is NaN or not. |
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61 | ///Is should be equivalent with std::isnan(), but it is not |
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62 | ///provided by all compilers. |
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63 | inline bool isNaN(double v) |
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64 | { |
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65 | return v!=v; |
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66 | } |
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67 | |
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68 | ///Round a value to its closest integer |
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69 | inline double round(double r) { |
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70 | return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5); |
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71 | } |
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72 | |
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73 | /// @} |
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74 | |
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75 | } //namespace lemon |
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76 | |
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77 | #endif //LEMON_MATH_H |
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