blob: 5da50b07a9d20ea556bb18f70c29ec94f772bf5b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* -*- mode: C++; indent-tabs-mode: nil; -*-
*
* This file is a part of LEMON, a generic C++ optimization library.
*
* Copyright (C) 2003-2013
* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
* (Egervary Research Group on Combinatorial Optimization, EGRES).
*
* Permission to use, modify and distribute this software is granted
* provided that this copyright notice appears in all copies. For
* precise terms see the accompanying LICENSE file.
*
* This software is provided "AS IS" with no warranty of any kind,
* express or implied, and with no claim as to its suitability for any
* purpose.
*
*/
#ifndef LEMON_MATH_H
#define LEMON_MATH_H
///\ingroup misc
///\file
///\brief Some extensions to the standard \c cmath library.
///
///Some extensions to the standard \c cmath library.
///
///This file includes the standard math library (cmath).
#include<cmath>
namespace lemon {
/// \addtogroup misc
/// @{
/// The Euler constant
const long double E = 2.7182818284590452353602874713526625L;
/// log_2(e)
const long double LOG2E = 1.4426950408889634073599246810018921L;
/// log_10(e)
const long double LOG10E = 0.4342944819032518276511289189166051L;
/// ln(2)
const long double LN2 = 0.6931471805599453094172321214581766L;
/// ln(10)
const long double LN10 = 2.3025850929940456840179914546843642L;
/// pi
const long double PI = 3.1415926535897932384626433832795029L;
/// pi/2
const long double PI_2 = 1.5707963267948966192313216916397514L;
/// pi/4
const long double PI_4 = 0.7853981633974483096156608458198757L;
/// sqrt(2)
const long double SQRT2 = 1.4142135623730950488016887242096981L;
/// 1/sqrt(2)
const long double SQRT1_2 = 0.7071067811865475244008443621048490L;
///Check whether the parameter is NaN or not
///This function checks whether the parameter is NaN or not.
///Is should be equivalent with std::isnan(), but it is not
///provided by all compilers.
inline bool isNaN(double v)
{
return v!=v;
}
///Round a value to its closest integer
inline double round(double r) {
return (r > 0.0) ? std::floor(r + 0.5) : std::ceil(r - 0.5);
}
/// @}
} //namespace lemon
#endif //LEMON_MATH_H
|
