MathConstant.h

/*
 *  Copyright (C) 2010  Regents of the University of Michigan
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __MATHCONSTANT_H__
#define __MATHCONSTANT_H__

#ifdef  _MSC_VER
#define _USE_MATH_DEFINES
#endif

#include <math.h>
#include <stdlib.h>

// Constants for numerical routines
//

#define TINY    1.0e-30        // A small number
#define ITMAX   200            // Maximum number of iterations
#define EPS     3.0e-7         // Relative accuracy
#define ZEPS    3.0e-10        // Precision around zero
#define FPMIN   1.0e-30        // Number near the smallest representable number
#define FPMAX   1.0e+100       // Number near the largest representable number
#define TOL     1.0e-6         // Zero SVD values below this
#define GOLD    0.61803399     // Golden ratio
#define CGOLD   0.38196601     // Complement of golden ratio

inline double square(double a)
{
    return a * a;
}
inline double sign(double a, double b)
{
    return b >= 0 ? fabs(a) : -fabs(a);
}
inline double min(double a, double b)
{
    return a < b ? a : b;
}
inline double max(double a, double b)
{
    return a > b ? a : b;
}

inline int square(int a)
{
    return a * a;
}
inline int sign(int a, int b)
{
    return b >= 0 ? abs(a) : -abs(a);
}
inline int min(int a, int b)
{
    return a < b ? a : b;
}
inline int max(int a, int b)
{
    return a > b ? a : b;
}

// Useful integer quantities
//

#define THIRTY_BIT_MASK      0x3FFFFFFF

#endif