G4INCL::IFunction1D Class Reference

#include <G4INCLIFunction1D.hh>

Inheritance diagram for G4INCL::IFunction1D:

Public Member Functions
	IFunction1D ()
	IFunction1D (const G4double x0, const G4double x1)
virtual	~IFunction1D ()
virtual G4double	getXMinimum () const
	Return the minimum allowed value of the independent variable. More...
virtual G4double	getXMaximum () const
	Return the maximum allowed value of the independent variable. More...
virtual G4double	operator() (const G4double x) const =0
	Compute the value of the function. More...
virtual G4double	integrate (const G4double x0, const G4double x1, const G4double step=-1.) const
	Integrate the function between two values. More...
IFunction1D *	primitive () const
	Return a pointer to the (numerical) primitive to this function. More...
InverseInterpolationTable *	inverseCDFTable (const G4int nNodes=60) const
	Return a pointer to the inverse of the CDF of this function. More...

Protected Attributes
G4double	xMin
	Minimum value of the independent variable. More...
G4double	xMax
	Maximum value of the independent variable. More...

Detailed Description

1D function interface

Definition at line 57 of file G4INCLIFunction1D.hh.

Constructor & Destructor Documentation

G4INCL::IFunction1D::IFunction1D ( )

inline

Definition at line 59 of file G4INCLIFunction1D.hh.

Referenced by inverseCDFTable(), and primitive().

                    :
        xMin(0.),
        xMax(0.)
    {};

G4INCL::IFunction1D::IFunction1D ( const G4double  x0, const G4double  x1  )

inline

Definition at line 63 of file G4INCLIFunction1D.hh.

                                                        :
        xMin(x0),
        xMax(x1)
    {};

virtual G4INCL::IFunction1D::~IFunction1D ( )

inlinevirtual

Definition at line 68 of file G4INCLIFunction1D.hh.

{};

Member Function Documentation

virtual G4double G4INCL::IFunction1D::getXMaximum ( ) const

inlinevirtual

Return the maximum allowed value of the independent variable.

Definition at line 74 of file G4INCLIFunction1D.hh.

References xMax.

Referenced by G4INCL::NuclearDensityFactory::createRPCorrelationTable(), inverseCDFTable(), G4INCL::InverseInterpolationTable::InverseInterpolationTable(), and primitive().

{ return xMax; }

virtual G4double G4INCL::IFunction1D::getXMinimum ( ) const

inlinevirtual

Return the minimum allowed value of the independent variable.

Definition at line 71 of file G4INCLIFunction1D.hh.

References xMin.

Referenced by G4INCL::NuclearDensityFactory::createRPCorrelationTable(), inverseCDFTable(), G4INCL::InverseInterpolationTable::InverseInterpolationTable(), and primitive().

{ return xMin; }

G4double G4INCL::IFunction1D::integrate ( const G4double  x0, const G4double  x1, const G4double  step = -1.  ) const

virtual

Integrate the function between two values.

Parameters

x0	lower integration bound
x1	upper integration bound
step	largest integration step size; if <0, 45 steps will be used

Returns

Definition at line 65 of file G4INCLIFunction1D.cc.

References G4INCL::Math::max(), G4INCL::Math::min(), operator()(), G4INCL::Math::sign(), CLHEP::swap(), test::x, xMax, and xMin.

                                                                                                 {
    G4double xi = std::max(x0, xMin);
    G4double xa = std::min(x1, xMax);
    G4double sign;

    if(x1 <= x0) {
      sign = -1.0;
      std::swap(xi, xa);
    } else
      sign = 1.0;

    const G4double interval = xa - xi;

    G4int nIntervals;
    if(step<0.) {
      nIntervals = 45;
    } else {
      nIntervals = G4int(interval/step);

      // Round up nIntervals to the closest multiple of 9
      G4int remainder = nIntervals % 9;
      if (remainder != 0)
        nIntervals += 9 - remainder;

      nIntervals = std::max(nIntervals, 9);
    }

    const G4double dx = interval/nIntervals;
    G4double result = (operator()(xi) + operator()(xa)) * integrationCoefficients[0]/2;
    for(G4int j = 1; j<nIntervals; ++j) {
      const G4double x = xi + interval*G4double(j)/G4double(nIntervals);
      const unsigned index = j%9;
      result += operator()(x) * integrationCoefficients[index];
    }

    return result*dx*sign;

  }

InverseInterpolationTable * G4INCL::IFunction1D::inverseCDFTable

(

const G4int

nNodes = 60

)

const

Return a pointer to the inverse of the CDF of this function.

Definition at line 122 of file G4INCLIFunction1D.cc.

References getXMaximum(), getXMinimum(), IFunction1D(), G4INCL::Math::min(), operator()(), test::x, xMax, and xMin.

Referenced by G4INCL::NuclearDensityFactory::createPCDFTable(), and G4INCL::NuclearDensityFactory::createRCDFTable().

                                                                                  {
    class InverseCDF : public IFunction1D {
      public:
        InverseCDF(IFunction1D const * const f) :
          IFunction1D(f->getXMinimum(), f->getXMaximum()),
          theFunction(f),
          normalisation(1./theFunction->integrate(xMin,xMax))
      {}

        G4double operator()(const G4double x) const {
          return std::min(1., normalisation * theFunction->integrate(xMin,x));
        }
      private:
        IFunction1D const * const theFunction;
        const G4double normalisation;
    } *theInverseCDF = new InverseCDF(this);

    InverseInterpolationTable *theTable = new InverseInterpolationTable(*theInverseCDF, nNodes);
    delete theInverseCDF;
    return theTable;
  }

virtual G4double G4INCL::IFunction1D::operator() ( const G4double  x ) const

pure virtual

Compute the value of the function.

Implemented in G4INCL::InverseInterpolationTable, G4INCL::NuclearDensityFunctions::ModifiedHarmonicOscillator, G4INCL::NuclearDensityFunctions::WoodsSaxon, G4INCL::NuclearDensityFunctions::Gaussian, G4INCL::NuclearDensityFunctions::ParisP, G4INCL::NuclearDensityFunctions::HardSphere, G4INCL::NuclearDensityFunctions::ModifiedHarmonicOscillatorRP, G4INCL::NuclearDensityFunctions::ParisR, G4INCL::NuclearDensityFunctions::WoodsSaxonRP, and G4INCL::NuclearDensityFunctions::GaussianRP.

Referenced by integrate(), inverseCDFTable(), and primitive().

IFunction1D * G4INCL::IFunction1D::primitive

(

)

const

Return a pointer to the (numerical) primitive to this function.

Definition at line 104 of file G4INCLIFunction1D.cc.

References getXMaximum(), getXMinimum(), IFunction1D(), operator()(), test::x, and xMin.

                                            {
    class Primitive : public IFunction1D {
      public:
        Primitive(IFunction1D const * const f) :
          IFunction1D(f->getXMinimum(), f->getXMaximum()),
          theFunction(f)
      {}

        G4double operator()(const G4double x) const {
          return theFunction->integrate(xMin,x);
        }
      private:
        IFunction1D const * const theFunction;
    } *thePrimitive = new Primitive(this);

    return thePrimitive;
  }

Field Documentation

G4double G4INCL::IFunction1D::xMax

protected

Maximum value of the independent variable.

Definition at line 98 of file G4INCLIFunction1D.hh.

Referenced by getXMaximum(), integrate(), and inverseCDFTable().

G4double G4INCL::IFunction1D::xMin

protected

Minimum value of the independent variable.

Definition at line 96 of file G4INCLIFunction1D.hh.

Referenced by getXMinimum(), integrate(), inverseCDFTable(), and primitive().

---

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

• G4INCLIFunction1D.hh
• G4INCLIFunction1D.cc