xMath.h

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#ifndef XMATH_H
#define XMATH_H
 
namespace xMath {
  inline double Pi() { return 3.14159265358979323846; }
  inline double GeVtoifm() { return 1. / 0.197; }  //5.06773; }
 
  // Bessel functions
  double BesselI(int n,
                 double x);  // integer order modified Bessel function I_n(x)
  double BesselK(int n,
                 double x);   // integer order modified Bessel function K_n(x)
  double BesselI0(double x);  // modified Bessel function I_0(x)
  double BesselK0(double x);  // modified Bessel function K_0(x)
  double BesselI1(double x);  // modified Bessel function I_1(x)
  double BesselK1(double x);  // modified Bessel function K_1(x)
  double BesselJ0(double x);  // Bessel function J0(x) for any real x
  double BesselJ1(double x);  // Bessel function J1(x) for any real x
  double BesselY0(double x);  // Bessel function Y0(x) for positive x
  double BesselY1(double x);  // Bessel function Y1(x) for positive x
  double StruveH0(double x);  // Struve functions of order 0
  double StruveH1(double x);  // Struve functions of order 1
  double StruveL0(double x);  // Modified Struve functions of order 0
  double StruveL1(double x);  // Modified Struve functions of order 1
 
  double
  BesselK0exp(double x);  // modified Bessel function K_0(x) without exponent
  double
  BesselK1exp(double x);  // modified Bessel function K_1(x) without exponent
  double BesselKexp(
    int n,
    double
      x);  // integer order modified Bessel function K_n(x) without exponent
}  // namespace xMath
 
#endif  // XMATH_H