plotting macro

Author: DanielSamitz

Tutorials/PWGEM/Cocktail/plotLFCocktail.C

@@ -0,0 +1,75 @@
+// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+const int nHists = 7;
+TH1F* mee[nHists];
+TH1F* mee_orig[nHists];
+TString histNames[nHists] = {"", "_Pi0", "_Eta", "_EtaP",
+                             "_Rho", "_Omega", "_Phi"};
+TString histLegends[nHists] = {
+  "Cocktail sum",
+  "#pi^{0}#rightarrow#gammae^{+}e^{-}",
+  "#eta#rightarrow#gammae^{+}e^{-}",
+  "#eta'#rightarrow#gammae^{+}e^{-}, #eta'#rightarrow#omegae^{+}e^{-}",
+  "#rho#rightarrowe^{+}e^{-}",
+  "#omega#rightarrow#pi^{0}e^{+}e^{-}, #omega#rightarrowe^{+}e^{-}",
+  "#phi#rightarrow#etae^{+}e^{-}, #phi#rightarrow#pi^{0}e^{+}e^{-}, "
+  "#phi#rightarrowe^{+}e^{-}"};
+
+void loadHistos(TFile* file, TH1F* hists[], TString name_extra, int rebin,
+                int nEvents)
+{
+  for (int i = 0; i < nHists; i++) {
+    hists[i] = (TH1F*)file->GetDirectory("em-lmee-lf-cocktail")
+                 ->Get(TString("mee") + name_extra + histNames[i]);
+    hists[i]->Rebin(rebin);
+    hists[i]->Scale(1. / nEvents);
+    hists[i]->SetTitle(histLegends[i]);
+  }
+}
+
+void plotLFCocktail(TString filename = "AnalysisResults.root", int rebin = 1)
+{
+
+  TFile* file = TFile::Open(filename.Data());
+
+  TH1I* hNEvents =
+    (TH1I*)file->GetDirectory("em-lmee-lf-cocktail")->Get("NEvents");
+  int nEvents = hNEvents->GetBinContent(1);
+
+  loadHistos(file, mee, "", rebin, nEvents);
+  loadHistos(file, mee_orig, "_orig", rebin, nEvents);
+
+  auto canvas = new TCanvas("LF Cocktail", "LF Cocktail", 1500, 500);
+  canvas->Divide(2, 1);
+
+  mee[0]->SetStats(0);
+  mee[0]->GetXaxis()->SetRangeUser(0.0, 1.1);
+  mee_orig[0]->SetStats(0);
+  mee_orig[0]->GetXaxis()->SetRangeUser(0.0, 1.1);
+
+  canvas->cd(1);
+  gPad->SetLogy();
+  for (int i = 0; i < nHists; i++) {
+    mee_orig[i]->SetLineColor(i + 1);
+    mee_orig[i]->Draw("same");
+  }
+  gPad->BuildLegend(0.62, 0.9, 0.9, 0.6);
+  mee_orig[0]->SetTitle("before resolution and acceptance");
+  canvas->cd(2);
+  gPad->SetLogy();
+  for (int i = 0; i < nHists; i++) {
+    mee[i]->SetLineColor(i + 1);
+    mee[i]->Draw("same");
+  }
+  gPad->BuildLegend(0.62, 0.9, 0.9, 0.6);
+  mee[0]->SetTitle("after resolution and acceptance");
+}