APWeightHist.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/


 
#ifndef APWeightHist_h
#define APWeightHist_h
#include "TH1D.h"
#include <string>
 
class APWeightEntry;
class TGraphErrors;
class TGraphAsymmErrors;
 
class APWeightHist : public TH1D {
 
public:
  APWeightHist(const char *name,const char *title, const int n_bins, const float x_min, const float x_max); 
  APWeightHist();                                                                
  ~APWeightHist();                                                               
  using TH1D::Fill;                                                              
  int Fill(const double value, APWeightEntry* weight);                           
  TGraphAsymmErrors* GetGraphStatUncert(bool autocompute = true);                
  TGraphErrors* GetGraphSystUncert(bool simple = true, bool autocompute = true); 
  void ComputeGraph(const int prec = 250);                                       
  TH1D* GetBinPDF(unsigned int bin, bool autocompute = true);                    /* Retrieves the PDF of a bin (starting with bin=1 in accordance with the TH1 classes, over- & underflow bins not accessible) */
  
  ClassDef(APWeightHist,1);                                                      
 
private:
  double m_computed_entries;                                                      
  std::vector< std::vector< APWeightEntry* > > m_binned_weights;                  
  std::vector< TH1D* > m_bin_dists;                                               
  std::vector< double > m_SumSys2;                                                
  TGraphAsymmErrors* m_graph_stat;                                                
  TGraphErrors* m_graph_syst;                                                     
  //int m_prec;                                                                     /*!< Holds the calculation precision (= amount of histograms & binning factor). */
 
};
 
#endif