#include "TPaletteAxis.h"
#include "TF1.h"
#include "TString.h"
#include "TGaxis.h"
#include "TProfile.h"
#include "TH1F.h"
#include "TH2F.h"
#include "THStack.h"
#include "TLegend.h"
#include "TText.h"
#include "TMathText.h"
#include "TFile.h"
#include "TDirectory.h"
#include "TStyle.h"
#include "TSystem.h"
#include "TROOT.h"
#include "TCanvas.h"
#include "TKey.h"
#include "TCollection.h"
#include <iostream>
#include <set>
#include <cmath>
using std::cout;
using std::endl;


void example(TFile *file = new TFile("file.root")){
   if (file->IsZombie()) cout << "Error opening file" << endl, exit(-1);
   TCanvas* c1=new TCanvas("c1","c1",800,800);
   TObject *o;
   gDirectory->GetObject("Canvas_1", o);
   o->Draw("hist");
   gPad->Print("hist.png");
   gPad->Print("hist.pdf");
}