G4StatDouble Class Reference

#include <G4StatDouble.hh>

Public Member Functions
	G4StatDouble ()
virtual	~G4StatDouble ()
void	reset ()
void	fill (G4double x, G4double weight=1.)
void	scale (G4double)
G4double	mean () const
G4double	rms ()
G4double	mean (G4double ext_sum_w) const
G4double	rms (G4double ext_sum_w, G4int ext_n)
G4int	n () const
G4double	sum_w () const
G4double	sum_w2 () const
G4double	sum_wx () const
G4double	sum_wx2 () const
Protected Member Functions
G4double	rms (G4double sum_wx, G4double sum_wx2, G4double sum_w, G4int n)
Protected Attributes
G4double	m_sum_wx
G4double	m_sum_wx2
G4int	m_n
G4double	m_sum_w
G4double	m_sum_w2
G4double	m_scale

---

Detailed Description

Definition at line 46 of file G4StatDouble.hh.

---

Constructor & Destructor Documentation

G4StatDouble::G4StatDouble

(

)

Definition at line 40 of file G4StatDouble.cc.

References reset().

{
  reset();
}

G4StatDouble::~G4StatDouble

(

)

[virtual]

Definition at line 55 of file G4StatDouble.cc.

{}

---

Member Function Documentation

void G4StatDouble::fill	(	G4double	x,
		G4double	weight = 1.
	)

Definition at line 58 of file G4StatDouble.cc.

References G4cout, G4endl, m_n, m_sum_w, m_sum_w2, m_sum_wx, and m_sum_wx2.

{
  m_sum_wx  += value * weight;
  m_sum_wx2 += value * value * weight;
  m_n++;
  m_sum_w   += weight;
  m_sum_w2  += weight * weight;

  if (weight <= 0.)
  {
    G4cout << "[G4StatDouble::fill] WARNING: weight<=0. "
           << weight << G4endl;
  }
}

G4double G4StatDouble::mean

(

G4double

ext_sum_w

)

const

Definition at line 88 of file G4StatDouble.cc.

References m_sum_w, and mean().

{
  G4double factor = 0.;
    // factor to rescale the Mean for the requested number
    // of events (or sum of weights) ext_sum_w

  if (ext_sum_w > 0)
  {
    factor  = m_sum_w;
    factor /= ext_sum_w;
  }
  return mean() * factor;

}

G4double G4StatDouble::mean

(

)

const

Definition at line 78 of file G4StatDouble.cc.

References m_scale, m_sum_w, and m_sum_wx.

Referenced by mean().

{
  G4double mean_val = 0.;
  if (m_sum_w > 0.)
  {
    mean_val = m_sum_wx / m_sum_w;
  }
  return m_scale * mean_val;
}

G4int G4StatDouble::n

(

)

const [inline]

Definition at line 70 of file G4StatDouble.hh.

References m_n.

{ return m_n; }

void G4StatDouble::reset

(

)

Definition at line 45 of file G4StatDouble.cc.

References m_n, m_scale, m_sum_w, m_sum_w2, m_sum_wx, and m_sum_wx2.

Referenced by G4StatDouble().

{
  m_sum_wx  = 0.;
  m_sum_wx2 = 0.;
  m_n       = 0;
  m_sum_w   = 0.;
  m_sum_w2  = 0.;
  m_scale   = 1.;
}

G4double G4StatDouble::rms	(	G4double	sum_wx,
		G4double	sum_wx2,
		G4double	sum_w,
		G4int	n
	)			[protected]

Definition at line 103 of file G4StatDouble.cc.

References m_scale.

{
  G4double vrms;
  if (nn > 1)
  {
    G4double vmean = ssum_wx / ssum_w;
    G4double xn = nn;
    G4double tmp = 
      // from GNU Scientific Library. This part is equivalent to N/(N-1)
      // when w_i = w
      // ((m_sum_w * m_sum_w) / (m_sum_w * m_sum_w - m_sum_w2)) 

      // from NIST "DATAPLOT Reference manual", Page 2-66 
      // http://www.itl.nist.gov/div898/software/dataplot/refman2/ch2/weightsd.pdf
      // rewritten based on: SUM[w(x-m)^2]/SUM[w] = SUM[wx^2]/SUM[w] - m^2
      // and dividing it by sqrt[n] to go from rms of distribution to the
      // rms of the mean value

      (1. / (xn - 1))
      * ((ssum_wx2 / ssum_w) - (vmean * vmean));

    if (tmp < 0.) tmp=0.; // this avoids observed computation problem
    vrms = std::sqrt( tmp );
//  G4cout << "[G4StatDoubleElement::rms] m_sum_wx: " << m_sum_wx
//         << "  m_sum_wx2: " << m_sum_wx2 << "  m_sum_w: " << m_sum_w
//         << "  m_n: " << m_n << "  tmp: " << tmp<< "  rms: " << rms
//         << G4endl;
//  G4cout << "[G4StatDoubleElement::rms] (m_n / (m_n - 1)): " << (xn/(xn - 1))
//         << "  (m_sum_wx2 / m_sum_w): " << (m_sum_wx2 / m_sum_w) 
//         << "  (mean * mean): " << (mean * mean) 
//         << "  ((m_sum_wx2 / m_sum_w) - (mean * mean)): "
//         << ((m_sum_wx2 / m_sum_w) - (mean * mean)) 
//         << G4endl;
  }
  else
  {
    vrms = -1.;
  }
  return vrms * m_scale;
}

G4double G4StatDouble::rms	(	G4double	ext_sum_w,
		G4int	ext_n
	)

Definition at line 153 of file G4StatDouble.cc.

References m_sum_wx, m_sum_wx2, and rms().

{
  // this method computes the RMS with sum_w and n coming from outside:
  // ext_sum_w and ext_n:
  // this means that the result is normalised to the external events
  // it is useful when, given a number ext_n of events with sum of the weights
  // ext_sum_w, only m_n (with sum of weights m_sum_w) are actually accumulated
  // in the internal summation (e.g. for a dose variable in a volume, because
  // only a few particles reach that volume) 

  return rms(m_sum_wx, m_sum_wx2, ext_sum_w, ext_n);
}

G4double G4StatDouble::rms

(

)

Definition at line 145 of file G4StatDouble.cc.

References m_n, m_sum_w, m_sum_wx, and m_sum_wx2.

Referenced by rms().

{
  // this method computes the RMS with "all internal" parameters:
  // all the sums are the internal ones: m_sum_wx, m_sum_wx2, m_sum_w, m_n

  return rms(m_sum_wx, m_sum_wx2, m_sum_w, m_n);
}

void G4StatDouble::scale

(

G4double

)

Definition at line 73 of file G4StatDouble.cc.

References m_scale.

{
  m_scale = m_scale * value;
}

G4double G4StatDouble::sum_w

(

)

const [inline]

Definition at line 71 of file G4StatDouble.hh.

References m_sum_w.

{ return m_sum_w; }

G4double G4StatDouble::sum_w2

(

)

const [inline]

Definition at line 72 of file G4StatDouble.hh.

References m_sum_w2.

{ return m_sum_w2; }

G4double G4StatDouble::sum_wx

(

)

const [inline]

Definition at line 73 of file G4StatDouble.hh.

References m_sum_wx.

{ return m_sum_wx; }

G4double G4StatDouble::sum_wx2

(

)

const [inline]

Definition at line 74 of file G4StatDouble.hh.

References m_sum_wx2.

{ return m_sum_wx2; }

---

Field Documentation

G4int G4StatDouble::m_n [protected]

Definition at line 84 of file G4StatDouble.hh.

Referenced by fill(), n(), reset(), and rms().

G4double G4StatDouble::m_scale [protected]

Definition at line 87 of file G4StatDouble.hh.

Referenced by mean(), reset(), rms(), and scale().

G4double G4StatDouble::m_sum_w [protected]

Definition at line 85 of file G4StatDouble.hh.

Referenced by fill(), mean(), reset(), rms(), and sum_w().

G4double G4StatDouble::m_sum_w2 [protected]

Definition at line 86 of file G4StatDouble.hh.

Referenced by fill(), reset(), and sum_w2().

G4double G4StatDouble::m_sum_wx [protected]

Definition at line 82 of file G4StatDouble.hh.

Referenced by fill(), mean(), reset(), rms(), and sum_wx().

G4double G4StatDouble::m_sum_wx2 [protected]

Definition at line 83 of file G4StatDouble.hh.

Referenced by fill(), reset(), rms(), and sum_wx2().

---

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

• G4StatDouble.hh
• G4StatDouble.cc

---