using namespace RooFit;

void test_uneven_binning(RooWorkspace my_ws, TH1D* myHist){
	
   RooAbsPdf *pdf = my_ws.pdf("myPdf");
   RooRealVar *obs = my_ws.var("myObs");

   TH1D* h_bkg = dynamic_cast<TH1D*>(myHist->Clone("h_bkg")); //myHist is defined with uneven binning
  
   const Double_t area = h_bkg->Integral();
   const Double_t xmin = h_bkg->GetXaxis()->GetXmin();
   const Double_t xmax = h_bkg->GetXaxis()->GetXmax();
 
   TAxis *xaxis= h_bkg->GetXaxis();
   const TArrayD * xarray = xaxis->GetXbins();
   const Double_t* bins = xarray->GetArray();
   RooBinning edges_bins(xaxis->GetNbins(), bins, "edges_bins");
   obs->setRange(xmin, xmax);
   obs->setBinning(edges_bins);

   RooDataHist dh_bkg("dh_bkg", "dh_bkg", *obs, Import(*h_bkg, kTRUE));

   pdf->fitTo(dh_bkg, RooFit::Minos(), RooFit::Save());
 
   my_ws.saveSnapshot("nominal", *pdf->getParameters(dh_bkg));
   TH1D *h_nominal = dynamic_cast<TH1D*>(pdf->createHistogram("htmp_nominal", *obs, RooFit::Binning(edges_bins)));
   if (h_nominal->Integral()) h_nominal->Scale(area / h_nominal->Integral());

 }