William J Deninger wrote: > > Rene, > How is one able to view via the TBrowser the "sum" of all histograms stored > in a tree tree. Is it even possible? > > Thanks again, William > > //______________________ > // incorrect attempt > //______________________ > { > // open root file > TFile f= new TFile("test.root", "recreate"); > f->SetCompressionLevel(1); > > // create canvas.. for viewing stuff > TCanvas *c1 = new TCanvas("c1","canvas"); > c1->cd(); > > // create tree > TTree *tree = new TTree("tree","test"); > tree->SetAutoSave(64000000); // 64MB autosave > > // create event tree branch > TSimple *simple = new TSimple; > TH1F *hist = new TH1F("hist","test histogram",100,0,100); > simple->hist = hist; > > tree->Branch("simple","TSimple",&simple,16000,1); > > // loop filling tree with 100 items > Int_t i; > for (i=0; i<100; i++) { hist->Fill( (Float_t) i); tree->Fill(); } > > // create browser > bb = new TBrowser; > tree->Draw("hist"); > } You can execute commands like: tree->Draw("hist.GetEntries()") tree->Draw("hist.GetMean()") tree->Draw("hist.GetBinContent(5)") you can invoke any member function of the object in the branch. Rene Brun
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