Hello all I have a very simple class with a TFile and a TTree, I would like to use it to fill an histogram, but when I try to access this histogramm, I have segmentation violation (call to NEH() method) : class Run : public TNamed { private: TH1F *fh; public: Run() { TFile f("essai.root"); TTree* t=(TTree*)f.Get("essait"); Float_t x; t->SetBranchAddress("X",&x); fh=new TH1F("essai","essai",100,0.,1.); for (Int_t i=0; i<t->GetEntries();i++) { t->GetEntry(i); fh->Fill(x); } cout << fh->GetEntries() << endl; }; virtual ~Run(); Stat_t NEH(){return fh->GetEntries();}; ClassDef(Run,1) }; in root I have : root [0] gSystem->Load("libess.so"); root [1] Run a; 100 root [2] a.NEH(); <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 Error: Symbol nan is not defined in current scope FILE: LINE:0 *** Interpreter error recovered *** *** Break *** segmentation violation (I don't ask for a plot) the problem is similar in all last root versions has someone an answer BR Jean-Pierre Ernenwein, GRPHE Universite de Haute Alsace, IUT Mulhouse, dept SGM / IReS Strasbourg Tel: 03 89 33 75 56 (IUT) / 03 88 10 66 19 ou 66 77 (IReS) Portable : 06 89 26 40 46
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