Arrow not visible on my arrow!

ROOT
1

Here is my code :

  TArrow * Arr_Variance = new TArrow(fit_x_min-sigma_min, fit_y_min+1. ,
				     fit_x_min+sigma_max, fit_y_min+1. ,
				     1., "<|>") ;

  
  // Draw
  graph_llh_2  -> Draw("AP"  ) ;
  Arr_Variance -> Draw("SAME") ;

But in my canvas the arrows are not visible all I get is a thin line. Any idea of what’s missing ?

Ok I’ve found it Idid :

Arr_Variance -> Draw("SAME <|>") ;
2

It works for me on a Linux machine with the latest ROOT version ( 5.17/05):

void graph_and_arrow() {

   TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);

   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);
   }
   gr = new TGraph(n,x,y);
   gr->SetMarkerStyle(20);
   gr->Draw("AP"); 

   TArrow *arrow = new TArrow(1.874544,8.536461,0.1366307,2.987824,0.05,"<|>");
   arrow->Draw();
}

c1.gif696×472 4.71 KB

3

Ok thanks,

I am using ROOT v 5.14, I will keep in mind to switch as soon as possible