#include <computils.h>

Collaboration diagram for true_mean:

Public Member Functions
	true_mean (TH1F *h)
double	mean () const
double	error () const

Private Attributes
double	m_mean
double	m_error

Detailed Description

Definition at line 130 of file computils.h.

Constructor & Destructor Documentation

◆ true_mean()

true_mean::true_mean ( TH1F * h )

Definition at line 82 of file computils.cxx.

                              : 
  m_mean(0), m_error(0) { 
  
  double f   = 0;
  double fx  = 0;
  double fx2 = 0;
 
  for ( int i=0 ; i<h->GetNbinsX() ; i++ ) {
    double w = h->GetBinLowEdge(i+2)-h->GetBinLowEdge(i+1);
    f   += h->GetBinContent(i+1)*w;
    fx  += h->GetBinContent(i+1)*w*h->GetBinCenter(i+1);
    fx2 += h->GetBinContent(i+1)*w*h->GetBinCenter(i+1)*h->GetBinCenter(i+1);
  }
 
  if ( f!=0 ) {   
    m_mean  = fx/f;
    m_error = std::sqrt( (fx2/f - m_mean*m_mean )/f );
  }    
 
}

Member Function Documentation

◆ error()

double true_mean::error ( ) const

inline

Definition at line 137 of file computils.h.

137{ return m_error; }

◆ mean()

double true_mean::mean ( ) const

inline

Definition at line 136 of file computils.h.

136{ return m_mean; }

Member Data Documentation

◆ m_error

double true_mean::m_error

private

Definition at line 142 of file computils.h.

◆ m_mean

double true_mean::m_mean