Histogram ROOT MACRO

ROOT
1

I am not able to change the title of histogram.I have drawn four histograms in same canvas.i am giving here the code too.

void ravu()
{
    gStyle->SetOptTitle(0);
    gStyle->SetOptTitle(3); // set hist title "Different PLots"
    
    
    
    b1->SetLineColor(1);
    b2->SetLineColor(2);
    b3->SetLineColor(3);
    b4->SetLineColor(4);
    
    b1->SetLineWidth(2);
    b2->SetLineWidth(3);
    b3->SetLineWidth(4);
    b4->SetLineWidth(5);
    
    b1->GetXaxis()->SetRangeUser(0,9000);
    b1->Draw("HIST");
    b2->Draw("same HIST");
    b3->Draw("same HIST");
    b4->Draw("same HIST");
    b1->GetXaxis()->SetTitle("Energy(KeV)");
    b1->GetYaxis()->SetTitle("P(E)");
    b1-> GetXaxis()-> SetTitleSize(0.050);
    b1-> GetYaxis()-> SetTitleSize(0.050);
    b1-> GetXaxis()-> SetTitleOffset(1.048); 
    b1-> GetYaxis()-> SetTitleOffset(1.048);
    auto legend = new TLegend(0.6,0.7,0.48,0.9);
    legend->AddEntry(b1,"b1","l");
    legend->AddEntry(b2,"b2","l");
    legend->AddEntry(b3,"b3","l");
    legend->AddEntry(b4,"b4","l");
    legend->Draw();
    
    
}
2

What are b1, b2, b3, and b4 (what type)?

3

These are different histograms ,my mentor has given me this file already created and want me to do this work ,like giving title,labelling axis etc.

4 
b1->Draw("HIST");

Will define the title of your plot. What is the Title of b1 ?

root [0] b1->GetTitle()
1 Like
5

So it’s (for example) b1->SetTitle("My Title"). Take a look at the TH1F Documentation

6

its not working.U run this macro and then see what type of errors it is showing

7

x-special/nautilus-clipboard
copy
file:///home/ravu/Downloads/c1.pdf

8

x-special/nautilus-clipboard
copy
file:///home/ravu/Downloads/response_all.root
check this.from this file u can get b1,b2,b3…

9

What you did doesn’t work

10

May I suggest you to start with Get Started, the ROOT Primer, and the many tutorials?

1 Like
11

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