Root::EGSelectors::SafeTH1 Class Reference

#include <SafeTH1.h>

Collaboration diagram for Root::EGSelectors::SafeTH1:

Public Member Functions
	SafeTH1 (TH1F *hist)
	~SafeTH1 ()
int	GetNbinsX () const
int	FindBin (double value) const
double	GetBinContent (int bin) const
double	GetBinLowEdge (int bin) const
double	Integral () const

Private Attributes
std::vector< float >	m_binContent
double	m_firstBinLowEdge
double	m_lastBinLowEdge
double	m_binWidth
double	m_integral

Detailed Description

Definition at line 12 of file SafeTH1.h.

Constructor & Destructor Documentation

SafeTH1()

Root::EGSelectors::SafeTH1::SafeTH1 ( TH1F *  hist )

inline

Definition at line 15 of file SafeTH1.h.

                     {
    const int nbins = hist->GetNbinsX();
    m_binContent.resize(nbins,0); // Note that the PDF over/underflows are unused and thus unrepresented here!
    for(int i = 0; i < nbins; ++i){
      m_binContent[i] = hist->GetBinContent(i+1);
    }
    m_firstBinLowEdge = hist->GetBinLowEdge(1);
    m_lastBinLowEdge  = hist->GetBinLowEdge(nbins);
    m_binWidth        = (m_lastBinLowEdge - m_firstBinLowEdge) / (GetNbinsX() - 1);
    m_integral        = hist->Integral(1,nbins);
  }

~SafeTH1()

Root::EGSelectors::SafeTH1::~SafeTH1 ( )

inline

Definition at line 26 of file SafeTH1.h.

{};

Member Function Documentation

FindBin()

int Root::EGSelectors::SafeTH1::FindBin ( double  value ) const

inline

Definition at line 33 of file SafeTH1.h.

                                 {
 
    if(value < m_firstBinLowEdge){
      return 0; // first bin of m_binContent
    }
    if(value > m_lastBinLowEdge){
      return GetNbinsX() - 1; // last bin of m_binContent
    }
    // note double rather than float due to incorrect rounding in O(1/10000) cases if float is used
    double bin_double = (value - m_firstBinLowEdge) / m_binWidth; 
    int bin = static_cast<int>(bin_double);
    return bin;
  }

GetBinContent()

double Root::EGSelectors::SafeTH1::GetBinContent ( int  bin ) const

inline

Definition at line 47 of file SafeTH1.h.

                                      {
    int nbins = this->GetNbinsX();
    // since we store the bin content in a vector we need a protection 
    // for cases where we try to access a non-existing bin. In these 
    // cases just go to the last bin
    return (bin>nbins) ? m_binContent[nbins-1] : m_binContent[bin];
  }

GetBinLowEdge()

double Root::EGSelectors::SafeTH1::GetBinLowEdge ( int  bin ) const

inline

Definition at line 54 of file SafeTH1.h.

                                      {
    return m_firstBinLowEdge + m_binWidth*bin;
  }

GetNbinsX()

int Root::EGSelectors::SafeTH1::GetNbinsX ( ) const

inline

Definition at line 28 of file SafeTH1.h.

                         {
    int n = m_binContent.size();
    return n;
  }

Integral()

double Root::EGSelectors::SafeTH1::Integral ( ) const

inline

Definition at line 57 of file SafeTH1.h.

                         {
    return m_integral;
  }

Member Data Documentation

m_binContent

std::vector<float> Root::EGSelectors::SafeTH1::m_binContent

private

Definition at line 62 of file SafeTH1.h.

m_binWidth

double Root::EGSelectors::SafeTH1::m_binWidth

private

Definition at line 65 of file SafeTH1.h.

m_firstBinLowEdge

double Root::EGSelectors::SafeTH1::m_firstBinLowEdge

private

Definition at line 63 of file SafeTH1.h.

m_integral

double Root::EGSelectors::SafeTH1::m_integral

private

Definition at line 66 of file SafeTH1.h.

m_lastBinLowEdge

double Root::EGSelectors::SafeTH1::m_lastBinLowEdge

private

Definition at line 64 of file SafeTH1.h.

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

• SafeTH1.h