G4StatDouble.hh

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// $Id:$
// GEANT4 tag $Name: not supported by cvs2svn $
//
// 
// ----------------------------------------------------------------------
// Class G4StatDouble
//
// Class description:
//
// Class providing simple "one variable statistics" capability.
 
// Original Author: Giovanni Santin (ESA) - October 2005 in GRAS tool
// Adaptation and comments by: John Apostolakis (CERN) - November 2011
 
#ifndef G4StatDouble_h
#define G4StatDouble_h 1
 
#include "globals.hh"
 
class G4StatDouble 
{
 
  public:
    G4StatDouble();
    virtual ~G4StatDouble();
 
  public:
 
    void reset();
    void fill(G4double x, G4double weight=1.);
      // Add new data point: value "x" with weight
    void scale(G4double);
      // Reset scale
 
    G4double mean() const;
    G4double rms();
      // The moments
 
    G4double mean(G4double ext_sum_w) const;
      // Mean scaled to sum of weights
    G4double rms(G4double ext_sum_w, G4int ext_n);
      // RMS  scaled to sum of weights
 
    inline G4int    n()       const { return m_n; }
    inline G4double sum_w()   const { return m_sum_w; }
    inline G4double sum_w2()  const { return m_sum_w2; }
    inline G4double sum_wx()  const { return m_sum_wx; }
    inline G4double sum_wx2() const { return m_sum_wx2; }
 
  protected:
 
    G4double rms(G4double sum_wx, G4double sum_wx2, G4double sum_w, G4int n);
 
  protected:
 
    G4double m_sum_wx;
    G4double m_sum_wx2;
    G4int    m_n;
    G4double m_sum_w;
    G4double m_sum_w2;
    G4double m_scale;
};
 
#endif