JMARKOV::J3DhistGenerator Class Reference

Implementation of the JGenerator interface. More...

#include <JMarkovGenerator.hh>

Inheritance diagram for JMARKOV::J3DhistGenerator:

Public Member Functions
	J3DhistGenerator (TH3 *_h)
	Constructor. More...
	~J3DhistGenerator ()
JPosition3D	getPosition ()
	Return a randomly generated position. More...
double	getWeight (JPosition3D pos)
	return the weight (=probability density dP/dV) for the given position. More...

Public Attributes
TH3 *	h

Detailed Description

Implementation of the JGenerator interface.

Generates positions uniformly by sampling from a histogram that represents the x,y,z distribution

Definition at line 656 of file JMarkovGenerator.hh.

Constructor & Destructor Documentation

JMARKOV::J3DhistGenerator::J3DhistGenerator ( TH3 *  _h )

inline

Constructor.

The histogram is cloned and automatically normalized.

Note: empty bins should always be avoided!

Definition at line 665 of file JMarkovGenerator.hh.

                                {
      // copy histogram
      h = (TH3*) _h->Clone( _h->GetName() ) ;
      // normalize histogram
      h->Scale( 1.0/h->Integral("width") ) ;
    }

JMARKOV::J3DhistGenerator::~J3DhistGenerator ( )

inline

Definition at line 672 of file JMarkovGenerator.hh.

                        {
      delete h ;
    }

Member Function Documentation

JPosition3D JMARKOV::J3DhistGenerator::getPosition ( )

inlinevirtual

Return a randomly generated position.

Implements JMARKOV::JGenerator.

Definition at line 676 of file JMarkovGenerator.hh.

                              {
      double x, y, z ;
      h->GetRandom3(x,y,z) ;
      return JPosition3D(x,y,z) ;
    }

double JMARKOV::J3DhistGenerator::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 682 of file JMarkovGenerator.hh.

                                        {
      // return 0 outside histogram range
      if( pos.getX()<h->GetXaxis()->GetXmin() || pos.getX()>=h->GetXaxis()->GetXmax() ) return 0.0 ;
      if( pos.getY()<h->GetYaxis()->GetXmin() || pos.getY()>=h->GetYaxis()->GetXmax() ) return 0.0 ;
      if( pos.getZ()<h->GetZaxis()->GetXmin() || pos.getZ()>=h->GetZaxis()->GetXmax() ) return 0.0 ;
      // return weight
      Int_t bin = h->FindBin( pos.getX(), pos.getY(), pos.getZ() ) ;
      return h->GetBinContent(bin) ;
    }

Member Data Documentation

TH3* JMARKOV::J3DhistGenerator::h

Definition at line 692 of file JMarkovGenerator.hh.

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

• JMarkovGenerator.hh