libStatGen Software  1
MathConstant.h
1 /*
2  * Copyright (C) 2010 Regents of the University of Michigan
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #ifndef __MATHCONSTANT_H__
19 #define __MATHCONSTANT_H__
20 
21 #ifdef _MSC_VER
22 #define _USE_MATH_DEFINES
23 #endif
24 
25 #include <math.h>
26 #include <stdlib.h>
27 
28 // Constants for numerical routines
29 //
30 
31 #define TINY 1.0e-30 // A small number
32 #define ITMAX 200 // Maximum number of iterations
33 #define EPS 3.0e-7 // Relative accuracy
34 #define ZEPS 3.0e-10 // Precision around zero
35 #define FPMIN 1.0e-30 // Number near the smallest representable number
36 #define FPMAX 1.0e+100 // Number near the largest representable number
37 #define TOL 1.0e-6 // Zero SVD values below this
38 #define GOLD 0.61803399 // Golden ratio
39 #define CGOLD 0.38196601 // Complement of golden ratio
40 
41 inline double square(double a)
42 {
43  return a * a;
44 }
45 inline double sign(double a, double b)
46 {
47  return b >= 0 ? fabs(a) : -fabs(a);
48 }
49 inline double min(double a, double b)
50 {
51  return a < b ? a : b;
52 }
53 inline double max(double a, double b)
54 {
55  return a > b ? a : b;
56 }
57 
58 inline int square(int a)
59 {
60  return a * a;
61 }
62 inline int sign(int a, int b)
63 {
64  return b >= 0 ? abs(a) : -abs(a);
65 }
66 inline int min(int a, int b)
67 {
68  return a < b ? a : b;
69 }
70 inline int max(int a, int b)
71 {
72  return a > b ? a : b;
73 }
74 
75 // Useful integer quantities
76 //
77 
78 #define THIRTY_BIT_MASK 0x3FFFFFFF
79 
80 #endif