JMARKOV::JGaussianGenerator Class Reference

Implementation of the JGenerator interface. More...

#include <JMarkovGenerator.hh>

Inheritance diagram for JMARKOV::JGaussianGenerator:

Public Member Functions
	JGaussianGenerator (double _sigma)
	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	sigma
double	C

Detailed Description

Implementation of the JGenerator interface.

Generates positions according to a 3D Gaussian distribution centered around the origin.

Definition at line 364 of file JMarkovGenerator.hh.

Constructor & Destructor Documentation

JMARKOV::JGaussianGenerator::JGaussianGenerator ( double  _sigma )

inline

Constructor.

The argument is the width of the gaussian.

Definition at line 370 of file JMarkovGenerator.hh.

                                        : sigma(_sigma) {
      C = 1.0 / ( 2*M_PI*sqrt(2*M_PI) * sigma * sigma * sigma ) ;
    }

Member Function Documentation

JPosition3D JMARKOV::JGaussianGenerator::getPosition ( )

inlinevirtual

Return a randomly generated position.

Implements JMARKOV::JGenerator.

Definition at line 374 of file JMarkovGenerator.hh.

                              {
      double x = gRandom->Gaus(0,sigma) ;
      double y = gRandom->Gaus(0,sigma) ;
      double z = gRandom->Gaus(0,sigma) ;
      return JPosition3D(x,y,z) ;
    }

double JMARKOV::JGaussianGenerator::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 381 of file JMarkovGenerator.hh.

                                        {
      return C*exp(-0.5*pos.getLengthSquared()/(sigma*sigma)) ;
    }

Member Data Documentation

const double JMARKOV::JGaussianGenerator::sigma

protected

Definition at line 387 of file JMarkovGenerator.hh.

double JMARKOV::JGaussianGenerator::C

protected

Definition at line 388 of file JMarkovGenerator.hh.

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

• JMarkovGenerator.hh