MathFunctions.h

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//            QMcBeaver
//
//         Constructed by 
//
//     Michael Todd Feldmann 
//              and 
//   David Randall "Chip" Kent IV
//
// Copyright 2000-2.  All rights reserved.
//
// drkent@users.sourceforge.net mtfeldmann@users.sourceforge.net

#ifndef MathFunctions_H
#define MathFunctions_H

#include <stdio.h>
#include <stdlib.h>
#include "IeeeMath.h"
#include <math.h>
#include "Array2D.h"

class MathFunctions
{
 public:

  static double legendre(int l, double x);

  static double erf(double x);

  static double erfc(double x);

  static double F_gamma(double v, double t);

  static double gamma_inc(double a, double x);

  static double gamma_log(double x2);

  static double gamma_series(double a, double x);

  static double gamma_cf(double a, double x);

  static double accel_G(double n, double x, double y,
                        double a, double zeta);
  static void fitU(double Z, double Frk, double r, double delta,
                   double & zeta, double & a, double & I);

  static double rij(Array2D<double> &R, int i, int j);
  
  static double rij(Array2D<double> &positioni,
                    Array2D<double> &positionj, 
                    int i, int j);

  static double fast_exp(double x);

  static const double pi = 3.141592653589793;
 private:
  static double csevl(double x, double * coef, int lengthCoef);

  /*
    Returns the value of x with the sign of y.
  */
  static double sign(double x, double y);
};

#endif

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