HistoCompare.cc

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

#include <iostream>

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

HistoCompare::HistoCompare(const 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, const TString& hname) {

    if (do_nothing_) return nullptr;
    
    //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_;
    
}