Hi, > (... Question One ...) > I do not understand this problem. You do not need to reset the bit Assume the following in the subroutine : TGraph *g = new TGraph(n, xtable, ytable) g->SetName("ACPE23Mat250NS"); g->SetTitle("ACPE23Mat250NS"); gDirectory->Append(g); Then, outside of the subroutine : root [2] gROOT->FindObject("ACPE23Mat250NS") (const class TObject*)0x8ec4c90 // IT IS THERE root [3] ACPE23Mat250NS->Draw("ALP") <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 Warning in <TH1::Build>: Replacing existing histogram: ACPE23Mat250NS (Potential memory leak). root [4] gROOT->FindObject("ACPE23Mat250NS") (const class TObject*)0x8ec4c90 // IT IS STILL THERE root [5] c1->Clear() root [6] gROOT->FindObject("ACPE23Mat250NS") (const class TObject*)0x0 // IT IS GONE And ... my graph is lost forever. I tried to protect myself against it using (in my subroutine) : g->ResetBit(kCanDelete); g->ResetBit(kMustCleanup); before gDirectory->Append(g), but it didn't help. Thanks in advance, Jacek.
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