RE: Displaying multiple histograms within same macro

Hi,

Fit() does the plot, like Draw(). Put "same" in Fit() and do not Draw the last histo (it will be drawn by Fit())

Ie do:

  hist2->Fit("f2","","same",2,150);

instead of:

  hist2->Fit("f2","","",2,150);
  f2->Draw("same");

Cheers, O.Couet

-----Original Message-----
From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch] On Behalf Of Deepak Kar
Sent: Wednesday, February 20, 2008 2:56 PM To: roottalk_at_root.cern.ch
Subject: [ROOT] Displaying multiple histograms within same macro

Hi,

I am trying to display 3 different histograms in the same canvas, and here is what I'm doing in my macro,
{

    TCanvas *c1= new TCanvas("c1");

 TFile f("../dy_histos/bhel_tlt.root");
 TProfile *hist1=(TProfile*)
gDirectory->Get("Ana/dyjet/Hist/dyjet_Tnchg5pairpt2"); //do things with hist1
 hist1->Draw();
 c1->Update();

 TFile f("../dy_histos/ze_gen.root");
 TProfile *hist2=(TProfile*)
gDirectory->Get("Ana/dyjet/Hist/dyjet_Tnchg5pairpt2");  // Do things with hist2
 hist2->Draw("same");

  TF1 *f2 = new
TF1("f2","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]/x+[5]/(x*x)",0,1000);   f2->SetLineColor(kRed);
  hist2->Fit("f2","","",2,150);
  f2->Draw("same");
}

It does what it is supposed to do with each histogram, and print hist1, hist2 and f2 individually. However when I run this macro, I end up getting the whatever is drawn last. How can I make it "remember" the eariler histograms? Putting Draw("same") does not help!

Thanks so much,
Deepak Received on Wed Feb 20 2008 - 15:15:07 CET