Histogram Entries off canvas

ROOT
1

Hi,

I am making histograms and drawing multiple on a single canvas, some histograms however, have entries that far exceed the y axis on my plot, resulting in an ugly bin going out through the border.

Here is the code I am using to make the plots:

#include <iostream>
#include <sstream>
#include "TStyle.h"
#include "TTree.h"
#include "TH1F.h"
#include "TCanvas.h"
#include "TFile.h"
#include <fstream>

using namespace std;

void compare_hists(void) {

  for(int mh=105;mh<=200;mh=mh+5)
    {
      stringstream oss;
      oss<<mh;
      string mhh = oss.str();
      string file_in = "/prj_root/6001/higgs_write/savannas/zh_llbb_new/vjets_05_04_01/results/TMVA/examples_zh/TMVA_muon_mh=";
      string file_out ="bdt_plots/";

      file_in.append(mhh);
      file_in.append("_");
      file_in.append(mhh);
      file_in.append(".root");
      file_out.append(mhh);
      file_out.append(".eps");

      const char *file_i=(char*)file_in.c_str();
      const char *file_o=(char*)file_out.c_str();

      TFile *tf = new TFile(file_i);
      TH1D* hist_2 = (TH1D*)tf->Get("Method_BDT/BDTG/MVA_BDTG_S");
      TH1D* hist_4 = (TH1D*)tf->Get("Method_BDT/BDTG/MVA_BDTG_Train_S");
      TH1D* hist_1 = (TH1D*)tf->Get("Method_BDT/BDTG/MVA_BDTG_B");
      TH1D* hist_3 = (TH1D*)tf->Get("Method_BDT/BDTG/MVA_BDTG_Train_B");

      //hist_2->SetAxisRange(0.0,0.25,"y");

      TCanvas* can = new TCanvas("BDTG output","BDTG output");
      hist_1->GetXaxis()->SetTitle("Background, Signal, Training, Testing");


      hist_1->SetLineWidth(2);
      hist_2->SetLineWidth(2);
      hist_3->SetLineWidth(2);
      hist_4->SetLineWidth(2);
      hist_1->SetLineColor(1);
      hist_2->SetLineColor(2);
      hist_3->SetLineColor(6);//67
      hist_4->SetLineColor(4);
      hist_1->Scale(1.0/hist_1->Integral());
      hist_2->Scale(1.0/hist_2->Integral());
      hist_3->Scale(1.0/hist_3->Integral());
      hist_4->Scale(1.0/hist_4->Integral());

      hist_1->Draw("hist");
      hist_4->Draw("samehist");
      hist_2->Draw("samehist");
      hist_3->Draw("samehist");


      // TLegend *leg2 = new TLegend(0.15,0.8,0.4,0.9,NULL,"brNDC");
      TLegend *leg2 = new TLegend(0.4,0.6,0.6,0.8,NULL,"brNDC");
      if(hist_1->Integral()>0) leg2->AddEntry(hist_1,"testing_background");
      if(hist_3->Integral()>0) leg2->AddEntry(hist_3,"training_background");
      if(hist_2->Integral()>0) leg2->AddEntry(hist_2,"testing_signal");
      if(hist_4->Integral()>0) leg2->AddEntry(hist_4,"training_signal");
      leg2->Draw("same hist");

      can->SaveAs(file_o);
    }
}

Thank you in advance,
Charlie Mueller

2

can you provide a small example we can run ? what you sent gives:

root [0]
Processing compare_hists.C...
Error in <TFile::TFile>: file /prj_root/6001/higgs_write/savannas/zh_llbb_new/vjets_05_04_01/results/TMVA/examples_zh/TMVA_muon_mh=105_105.root does not exist
Error: illegal pointer to class object hist_1 0x0 867  compare_hists.C:41:
*** Interpreter error recovered ***
root [1]