[ROOT] Question about accessing histos from two different files

From: Jyothsna Rani (jyothsna@fnal.gov)
Date: Tue Sep 17 2002 - 22:27:14 MEST 

Hi,

I would like to access two profile/ 2D histos from two different files and
would like to divide them.

When I use the following code to do that I get a funny plot for sign.  Is
there a better way of doing it?

Thanks for any help,
Jyothsna

////////////////////////////////////////////////////////////
{
TFile bbh("signal.root");
TFile qcd("bgd.root");

TCanvas *c1 = new TCanvas("c1","c1",600,600);
c1->cd();
bbh->cd();
signal_et1cut.Draw();

TProfile *sig_et1 = (TProfile*)signal_et1cut->Clone();

TCanvas *c2 = new TCanvas("c2","c2",600,600);
c2->cd();
qcd->cd();
bgd_et1cut.Draw();

TProfile *bgd_et1 = (TProfile*)bgd_et1cut->Clone();

TCanvas *c3 = new TCanvas("c3","c3",600,600);
c3->cd();
TProfile *sign = new TProfile("sign","",50,0.,95.,0,800);
sign.Divide(sig_et1,bgd_et1,1.,1.,"B");
sign.Draw();
}
   -------------------------------------------------------------
        K. Jyothsna Rani,       Phone Number:
        Tata Institute,                 630-840-3590 (Office)
        DZero Experiment,               630-840-4236 (Residence)
        Mail Station : 352,     FAX:
        P.O.Box : 500,                  630-840-8481
        Fermilab,               E-mail:
        Batavia, IL - 60510             jyothsna@fnal.gov
  ---------------------------------------------------------------

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