/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/Validation/RecoB/src/HistoCompare.cc

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#include "Validation/RecoB/interface/HistoCompare.h"

#include <iostream>

HistoCompare::HistoCompare() {
  result_ = 0;
  do_nothing_ = false;
}

HistoCompare::HistoCompare(TString refFilename) {

        result_ = 0;
        do_nothing_ = false;
        // open reference file
        refFile_ = new TFile(refFilename);
        if (refFile_->IsZombie()) {
                std::cout << " Error openning file " << refFilename << std::endl;
                std::cout << " we will not compare histograms. " << std::endl;
                do_nothing_ = true;
        } else {
                std::cout << " open file " << refFilename << std::endl;
        }
        
        setChi2Test_ = true;
        
}

HistoCompare::~HistoCompare() {
}


TH1* HistoCompare::Compare(TH1 *h, TString hname) {

        if (do_nothing_) return 0;
        
        //std::cout << "histo: " << h->GetName() << " entries: "<< h->GetEntries() << std::endl;
        //std::cout << "hname: " << hname << std::endl;

        
        //create a residual histogram
        //if (resHisto_) delete resHisto_;
        resHisto_ = (TH1*) h->Clone(TString(h->GetName())+"_residuals");
        resHisto_->Reset();

        // clone input histogram
        TH1 *htemp = (TH1*) h->Clone(TString(h->GetName()));

        refFile_->cd();
        //std::cout << "get reference" << std::endl;
        refHisto_ = (TH1*) gDirectory->Get( hname );
        //std::cout << "historef: " << refHisto_->GetName() << " entries: "<< refHisto_->GetEntries() << std::endl;
        //std::cout << "name: " << refHisto_->GetName() << std::endl;


        // normalize histograms
        htemp->Scale(1./htemp->Integral());
        refHisto_->Scale(1./refHisto_->Integral());
        
        if (setChi2Test_) {
                result_ = refHisto_->Chi2Test(htemp,"UFOF");
        }
        if (setKGTest_) {
                result_ = refHisto_->KolmogorovTest(htemp,"UO");
        }

        
        resHisto_->Add( htemp, refHisto_, 1., -1.);
        
        //std::cout << " residual done." << std::endl;
        
        return resHisto_;
        
}