JMARKOV::JExpRsqInvGenerator Class Reference

Implementation of the JGenerator interface. More...

#include <JMarkovGenerator.hh>

Inheritance diagram for JMARKOV::JExpRsqInvGenerator:

Public Member Functions
	JExpRsqInvGenerator (double _lambda)
	Constructor. More...
JPosition3D	getPosition ()
	Return a randomly generated position. More...
double	getWeight (JPosition3D pos)
	return the weight (=probability density dP/dV) for the given position. More...

Protected Attributes
const double	lambda

Detailed Description

Implementation of the JGenerator interface.

Generates positions according to the distribution

1/r^2 exp(-r/lambda)

around the origin.

Definition at line 151 of file JMarkovGenerator.hh.

Constructor & Destructor Documentation

JMARKOV::JExpRsqInvGenerator::JExpRsqInvGenerator ( double  _lambda )

inline

Constructor.

The argument is the radius of the ball.

Definition at line 157 of file JMarkovGenerator.hh.

: lambda(_lambda) {}

Member Function Documentation

JPosition3D JMARKOV::JExpRsqInvGenerator::getPosition ( )

inlinevirtual

Return a randomly generated position.

Implements JMARKOV::JGenerator.

Definition at line 159 of file JMarkovGenerator.hh.

                              {
      double xi = gRandom->Uniform() ;
      double r = -lambda*log(1-xi) ;
      double x,y,z ;
      gRandom->Sphere(x,y,z,r) ;
      return JPosition3D(x,y,z) ;
    }

double JMARKOV::JExpRsqInvGenerator::getWeight ( JPosition3D  pos )

inlinevirtual

return the weight (=probability density dP/dV) for the given position.

When the generator is properly normalized, the integral of this quantity over the whole space is 1.

Implements JMARKOV::JGenerator.

Definition at line 167 of file JMarkovGenerator.hh.

                                        {
      double r = pos.getLength() ;
      return lambda*exp(-r/lambda)/(r*r*4*M_PI) ;
    }

Member Data Documentation

const double JMARKOV::JExpRsqInvGenerator::lambda

protected

Definition at line 174 of file JMarkovGenerator.hh.

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

• JMarkovGenerator.hh