G4VGaussianQuadrature Class Reference

#include <G4VGaussianQuadrature.hh>

Inheritance diagram for G4VGaussianQuadrature:

Public Member Functions
	G4VGaussianQuadrature (function pFunction)
virtual	~G4VGaussianQuadrature ()
G4double	GetAbscissa (G4int index) const
G4double	GetWeight (G4int index) const
G4int	GetNumber () const

Protected Member Functions
G4double	GammaLogarithm (G4double xx)

Protected Attributes
function	fFunction
G4double *	fAbscissa
G4double *	fWeight
G4int	fNumber

Detailed Description

Definition at line 66 of file G4VGaussianQuadrature.hh.

Constructor & Destructor Documentation

G4VGaussianQuadrature::G4VGaussianQuadrature ( function  pFunction )

explicit

Definition at line 36 of file G4VGaussianQuadrature.cc.

  : fFunction(pFunction), fAbscissa(0), fWeight(0), fNumber(0)
{
}

G4VGaussianQuadrature::~G4VGaussianQuadrature ( )

virtual

Definition at line 46 of file G4VGaussianQuadrature.cc.

{
   delete[] fAbscissa ;
   delete[] fWeight   ;
}

Member Function Documentation

G4double G4VGaussianQuadrature::GammaLogarithm ( G4double  xx )

protected

Definition at line 77 of file G4VGaussianQuadrature.cc.

{

// Returns the value ln(Gamma(xx) for xx > 0.  Full accuracy is obtained for 
// xx > 1. For 0 < xx < 1. the reflection formula (6.1.4) can be used first.
// (Adapted from Numerical Recipes in C)

  static const G4double cof[6] = { 76.18009172947146,     -86.50532032941677,
                                  24.01409824083091,      -1.231739572450155,
                                   0.1208650973866179e-2, -0.5395239384953e-5 };
  G4double x = xx - 1.0;
  G4double tmp = x + 5.5;
  tmp -= (x + 0.5) * std::log(tmp);
  G4double ser = 1.000000000190015;

  for ( size_t j = 0; j <= 5; j++ )
  {
    x += 1.0;
    ser += cof[j]/x;
  }
  return -tmp + std::log(2.5066282746310005*ser);
}

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G4double G4VGaussianQuadrature::GetAbscissa

(

G4int

index

)

const

Definition at line 55 of file G4VGaussianQuadrature.cc.

{
   return fAbscissa[index] ;
}

G4int G4VGaussianQuadrature::GetNumber

(

)

const

Definition at line 66 of file G4VGaussianQuadrature.cc.

{
   return fNumber ;
}

G4double G4VGaussianQuadrature::GetWeight

(

G4int

index

)

const

Definition at line 61 of file G4VGaussianQuadrature.cc.

{
   return fWeight[index] ;
}

Member Data Documentation

G4double* G4VGaussianQuadrature::fAbscissa

protected

Definition at line 88 of file G4VGaussianQuadrature.hh.

function G4VGaussianQuadrature::fFunction

protected

Definition at line 87 of file G4VGaussianQuadrature.hh.

G4int G4VGaussianQuadrature::fNumber

protected

Definition at line 90 of file G4VGaussianQuadrature.hh.

G4double* G4VGaussianQuadrature::fWeight

protected

Definition at line 89 of file G4VGaussianQuadrature.hh.

---

The documentation for this class was generated from the following files:

• geant4.10.03.p01/source/global/HEPNumerics/include/G4VGaussianQuadrature.hh
• geant4.10.03.p01/source/global/HEPNumerics/src/G4VGaussianQuadrature.cc