EvtItgSimpsonIntegrator Class Reference

#include <EvtItgSimpsonIntegrator.hh>

Inheritance diagram for EvtItgSimpsonIntegrator:

Public Member Functions
	EvtItgSimpsonIntegrator (const EvtItgAbsFunction &, double precision=1.0e-5, int maxLoop=20)
virtual	~EvtItgSimpsonIntegrator ()
	EvtItgSimpsonIntegrator (const EvtItgAbsFunction &, double precision=1.0e-5, int maxLoop=20)
virtual	~EvtItgSimpsonIntegrator ()
Public Member Functions inherited from EvtItgAbsIntegrator
	EvtItgAbsIntegrator (const EvtItgAbsFunction &)
virtual	~EvtItgAbsIntegrator ()
double	evaluate (double lower, double upper) const
double	normalisation () const
	EvtItgAbsIntegrator (const EvtItgAbsFunction &)
virtual	~EvtItgAbsIntegrator ()
double	evaluate (double lower, double upper) const
double	normalisation () const

Protected Member Functions
virtual double	evaluateIt (double, double) const
virtual double	evaluateIt (double, double) const
Protected Member Functions inherited from EvtItgAbsIntegrator
double	trapezoid (double lower, double higher, int n, double &result) const
virtual double	evaluateIt (double lower, double higher) const =0
double	myFunction (double x) const
double	trapezoid (double lower, double higher, int n, double &result) const
virtual double	evaluateIt (double lower, double higher) const =0
double	myFunction (double x) const

Detailed Description

Definition at line 35 of file bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.hh.

Constructor & Destructor Documentation

EvtItgSimpsonIntegrator() [1/2]

EvtItgSimpsonIntegrator::EvtItgSimpsonIntegrator	(	const EvtItgAbsFunction &	theFunction,
		double	precision = 1.0e-5,
		int	maxLoop = 20
	)

Definition at line 49 of file bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.cc.

                                                                                                                   :
  EvtItgAbsIntegrator(theFunction),
  _precision(precision),
  _maxLoop(maxLoop)
{}

Referenced by EvtItgSimpsonIntegrator().

~EvtItgSimpsonIntegrator() [1/2]

EvtItgSimpsonIntegrator::~EvtItgSimpsonIntegrator ( )

virtual

Definition at line 60 of file bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.cc.

{}

EvtItgSimpsonIntegrator() [2/2]

EvtItgSimpsonIntegrator::EvtItgSimpsonIntegrator	(	const EvtItgAbsFunction &	,
		double	precision = 1.0e-5,
		int	maxLoop = 20
	)

~EvtItgSimpsonIntegrator() [2/2]

virtual EvtItgSimpsonIntegrator::~EvtItgSimpsonIntegrator ( )

virtual

Member Function Documentation

evaluateIt() [1/2]

double EvtItgSimpsonIntegrator::evaluateIt ( double  lower, double  higher  ) const

protectedvirtual

Implements EvtItgAbsIntegrator.

Definition at line 64 of file bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.cc.

                                                                    {
  
  // report(INFO,"EvtGen")<<"in evaluate"<<endl;
  int j;
  double result(0.0);
  double s, st, ost(0.0);
  for (j=1;j<4;j++) {
    st = trapezoid(lower, higher, j, result);
    s = (4.0 * st - ost)/3.0;
    ost=st;
  }
 
  double olds(s);
  st = trapezoid(lower, higher, j, result);
  s = (4.0 * st - ost)/3.0;
 
  if (fabs(s - olds) < _precision*fabs(olds) || (s==0.0 && olds==0.0))     return s;
  
  ost=st;
 
  for (j=5;j<_maxLoop;j++){
 
    st = trapezoid(lower, higher, j, result);
    s = (4.0 * st - ost)/3.0;
    
    if (fabs(s - olds) < _precision*fabs(olds) || (s==0.0 && olds==0.0))    return s;
    olds=s;
    ost=st;
  }
  
  report(ERROR,"EvtGen") << "Severe error in EvtItgSimpsonIntegrator.  Failed to converge after loop with 2**"
         << _maxLoop << " calls to the integrand in." << endl;
  
  return 0.0;
    
}

evaluateIt() [2/2]

virtual double EvtItgSimpsonIntegrator::evaluateIt ( double  , double    ) const

protectedvirtual

Implements EvtItgAbsIntegrator.

---

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

• bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.hh
• BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.hh
• bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.cc
• BesEvtGen-00-04-08/src/EvtGen/EvtGenModels/EvtItgSimpsonIntegrator.cc