Hi Pavel, In addition to previous comments about buffer size, use split level = 1. Move to a recent version (eg 3.05/07 or 3.10/01) Here is a working example void pavel() { TFile f_out("pavel.root","recreate"); TTree *tree = new TTree("tree","2D matrix"); TList *list = new TList; TH1F *h1 = new TH1F("h1","h1 title",100,-3,3); h1->FillRandom("gaus"); TH1F *h2 = new TH1F("h2","h2 title",100,-3,3); h2->FillRandom("gaus",20000); list->Add(h1); list->Add(h2); tree->Branch(list,32000,1); tree->Fill(); h1->FillRandom("gaus"); h2->FillRandom("gaus",20000); tree->Fill(); tree->Print(); tree->Write(); } Rene Brun Pavel Golubev wrote: > > Hi rooters, > I have problem to save list of objects (TH2F histograms) on Ttree. > I am running ROOT Version 3.02/07 > After > > TFile f_out(out_file,"recreate"); > TTree *tree = new TTree("tree","2D matrix"); > > TList *list = new TList; > > I create and fill number of TH2F histograms in the TList *list. > > list->Add(hist); > hist -> Fill(x, y, 1); > > Than I use special branch constructor TTree::Branch(TList*list, Int_t > bufsize, Int_t splitlevel) > as suggested on ROOTtalk. > > tree->Branch(list,70000000,2); > tree->Fill(); > > But the output file seem to me does not contain any TH2F histograms. > Also I get messages "R__zip: source buffer too big". > Best regards, > /Pavel
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