Jpp 19.3.0-rc.2
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JMARKOV::JGaussianGenerator Class Reference

Implementation of the JGenerator interface. More...

#include <JMarkovGenerator.hh>

Inheritance diagram for JMARKOV::JGaussianGenerator:
JMARKOV::JGenerator

Public Member Functions

 JGaussianGenerator (double _sigma)
 Constructor.
 
JPosition3D getPosition ()
 Return a randomly generated position.
 
double getWeight (JPosition3D pos)
 return the weight (=probability density dP/dV) for the given position.
 

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 368 of file JMarkovGenerator.hh.

Constructor & Destructor Documentation

◆ JGaussianGenerator()

JMARKOV::JGaussianGenerator::JGaussianGenerator ( double _sigma)
inline

Constructor.

The argument is the width of the gaussian.

Definition at line 374 of file JMarkovGenerator.hh.

374 : sigma(_sigma) {
375 C = 1.0 / ( 2*M_PI*sqrt(2*M_PI) * sigma * sigma * sigma ) ;
376 }

Member Function Documentation

◆ getPosition()

JPosition3D JMARKOV::JGaussianGenerator::getPosition ( )
inlinevirtual

Return a randomly generated position.

Implements JMARKOV::JGenerator.

Definition at line 378 of file JMarkovGenerator.hh.

378 {
379 double x = gRandom->Gaus(0,sigma) ;
380 double y = gRandom->Gaus(0,sigma) ;
381 double z = gRandom->Gaus(0,sigma) ;
382 return JPosition3D(x,y,z) ;
383 }

◆ getWeight()

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 385 of file JMarkovGenerator.hh.

385 {
386 return C*exp(-0.5*pos.getLengthSquared()/(sigma*sigma)) ;
387 }

Member Data Documentation

◆ sigma

const double JMARKOV::JGaussianGenerator::sigma
protected

Definition at line 391 of file JMarkovGenerator.hh.

◆ C

double JMARKOV::JGaussianGenerator::C
protected

Definition at line 392 of file JMarkovGenerator.hh.


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