: Re: [ROOT] two histograms with two different scales and different origins (Reply to message posted March 5, 2002 by Rene Brun)

From: Jamila Hussain (jamila@phys.columbia.edu)
Date: Mon Mar 01 2004 - 21:41:20 MET 

Hello Rooters,

I have tried to produce a plot with the axis of one histogram plotted on
the left side of the pad, and the axis of the other histogram on the right
side.  Since the scales differ by two orders of magnitude with different
minima, I thought to use the TProfile class as below.  However, if I replace

h1->Draw();     with h1->Draw("ah");

the left axis still plots.  How can I suppress plotting
of the y-axis of one of the histograms?  Is the "ah" option designed to
work for the TProfile::Draw ?


Thanks,
Jamila Hussain


{
   TH1F *h1 = new TH1F("h1","h1",100,-4,4);
   TProfile *h2  = new TProfile("h2","pz vs px",100,-3,3,0,20);
   Float_t px, py, pz;
   for (Int_t i = 0; i < 25000; i++) {
     gRandom->Rannor(px,py);
     pz = px*px + py*py;
     h1->Fill(px);
     h2->Fill(px,pz);
   }
   h1->Draw();
   TPad *pad = new TPad("pad","pad",0,0,1,1);
   pad->SetFillStyle(4000);
   pad->SetFrameFillStyle(4000);
   pad->Draw();
   pad->cd();
   pad->SetLeftMargin(0.2);
   pad->SetBottomMargin(0.2);
   h2->Draw();
}

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