Hi,
I am using root 4.04/02b
I notice a strange problem while running this :
{
gROOT->Reset();
gStyle->SetOptStat(1111);
TChain ch(“cnt”);
ch.Add("/projects/903/R1.18/mc_files/n13_n14/reducedL010185");
TH2F *shw_0_1_energy = new TH2F(“shw_0_1_energy”,“shw energy”,200,0,50,200,0,50);
TH2F *shw_0_1_vtxz = new TH2F(“vtxz”,“abs(trk vtx z - shw vtx z)”,200,0,7,200,0,7);
TCanvas c1(“c1”,"",0,0,900,900);
c1.Divide(2,2);
c1.cd(1);
ch.Draw(“shwl[0].ph:shwl[1].ph>>shw_0_1_energy”,“evsum.ntracks==1 && evsum.nshowers==2”,"");
shw_0_1_energy->GetXaxis()->SetTitle(“2ndary shower energy (GeV)”);
shw_0_1_energy->GetYaxis()->SetTitle(“primary shower energy (GeV)”);
c1.cd(2);
ch.Draw(“abs(trkl.beg.z-shwl[0].vtx.z):abs(trkl.beg.z-shwl[1].vtx.z)>>shw_0_1_vtxz”,“evsum.ntracks==1 && evsum.nshowers==2”,"");
shw_0_1_vtxz->GetXaxis()->SetTitle(“2ndary shower delz (GeV)”);
shw_0_1_vtxz->GetYaxis()->SetTitle(“primary shower delz (GeV)”);
}
If I run this file twice in the same root session, I see a warning message:
Warning in TH1::Build: Replacing existing histogram: shw_0_1_energy (Potential memory leak)
But I dont see this message when I use the exact same script with a TFile instead of a TChain.
-thanks Debdatta.
}