How to set bar width and X-axis range in TGraph bar chart

ROOT
1

Dear ROOT experts,

I’ve made a simple bar chart by TGraph. Now I need to change the bar width and X-axis range. How can I do this?

Thanks in advance

2 
void graph() {
   const Int_t n = 20;
   Double_t x[n], y[n];

   for (Int_t i=0;i<n;i++) {
     x[i] = i*0.1;
     y[i] = 10*sin(x[i]+0.2)-5;
   }

   TGraph *gr = new TGraph(n,x,y);
   gr->SetTitle("Hello");
   gr->SetMarkerStyle(20);
   gStyle->SetBarWidth(0.5);
   gr->Draw("A B");
}
1 Like
3 
void graph() {
   const Int_t n = 20;
   Double_t x[n], y[n];

   for (Int_t i=0;i<n;i++) {
     x[i] = i*0.1;
     y[i] = 10*sin(x[i]+0.2)-5;
   }

   TGraph *gr = new TGraph(n,x,y);
   gr->SetTitle("Hello");
   gr->SetMarkerStyle(20);
   gStyle->SetBarWidth(0.5);
   gr->Draw("A B");
}

Thanks a lot for your answer. I used gstyle->… to change bar width. one of my problems has been solved. But still I don’t know how to change X-axis range.

4

it would be gr->GetXaxis()->SetRangeUser(0.,1.);
But I see a clipping issue.