Change numbering on y axis

Hi all, I am plotting 10 graphs sharing the same x axis on top of each other. Ten plots on top of each other is quite a lot and so my y axis gets a bit crowded. As of now, my y axis shows 0, 0.2, 0.4, 0.6, 0.8 and 1. In order to make my y axis less crowded I would like it to only show 0, 0.5 and 1, but I’m not sure how to do this. Thanks!

#include "TFile.h"
#include "TCanvas.h"
#include "TH1.h"
#include "TGraphAsymmErrors.h"

void mjj_matched_J40 (){
  auto f = new TFile ("HaddOutput.root");
  
  std::vector<int> pT2Cut = {90, 100, 110, 120, 130};
  int n =  pT2Cut.size();
  TH1D* h1[n];
  TH1D* h2[n];
  TH1D* h3[n];
  TGraphAsymmErrors *ratio_lead[n];
  TGraphAsymmErrors *ratio_sublead[n];
  
  TCanvas *c = new TCanvas("c", "", 500, 1000);
  c->Divide(1, 10, 0, 0);
  
  for (int i = 0; i < n; i++) {
    f->GetObject(TString::Format("pT2Cut_%d/Total", pT2Cut[i]), h1[i]);
    f->GetObject(TString::Format("pT2Cut_%d/Lead", pT2Cut[i]), h2[i]);
    f->GetObject(TString::Format("pT2Cut_%d/Sublead", pT2Cut[i]), h3[i]);

    c->cd(2*i+1);
    ratio_lead[i] = new TGraphAsymmErrors();
    ratio_lead[i]->Divide(h2[i], h1[i]);
    ratio_lead[i]->Draw("ap");
    gPad->SetGridx(); 

    ratio_lead[i]->GetXaxis()->SetLimits(0, 345);     
    ratio_lead[i]->SetMaximum(1.1);     
    ratio_lead[i]->SetMinimum(0);        
        
    ratio_lead[i]->GetYaxis()->SetTitle("Lead");
    ratio_lead[i]->GetXaxis()->SetTitle("m_{JJ} (GeV)");     
   
    c->cd(2*i+2);
    gPad->SetTickx(); 
    gPad->SetGridx();
    ratio_sublead[i] = new TGraphAsymmErrors("f");
    ratio_sublead[i]->Divide(h3[i], h1[i]);
    ratio_sublead[i]->Draw("ap");
 
    ratio_sublead[i]->GetXaxis()->SetLimits(0, 345);   
    ratio_sublead[i]->SetMaximum(1.1);     
    ratio_sublead[i]->SetMinimum(0);    
   
    ratio_sublead[i]->GetYaxis()->SetTitle("Sublead"); 
    ratio_sublead[i]->GetXaxis()->SetTitle("m_{JJ} (GeV)");     
   }
   c->cd(0);
}

The method you need is SetNdivisions:

ratio_lead[i]->GetYaxis()->SetNdivisions(...);

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.