Dear Rooters, The TBrowser is a very nice device, but I need to draw a histogram from directory in the formal way. I failed trying it in this way .... TFile *hfile=new TFile("prob.root"); top->cd(); plane6->cd(); page = new TCanvas("page","Probability",0,0,500,700); page->SetFillColor(10); page->Divide(1,1); Int_t kpad,ans; char padname[20]; kpad=0; sprintf(padname,"page_%d",kpad+1); TPad *pad = (TPad*)page->GetPrimitive(padname); pad->cd(); pad->SetGrid(); pad->SetLogy(); pad->GetFrame()->SetFillColor(42); pad->GetFrame()->SetBorderMode(-1); pad->GetFrame()->SetBorderSize(5); pad->Draw(); char hname[20]; TH1 *h; sprintf(hname,"h%d",kpad+12); h=(TH1F*)hfile.Get(hname); h.SetLineWidth(2); h.SetLineStyle(1); h.SetLineColor(1); h.SetXTitle("k"); h.SetYTitle("N"); h.SetMinimum(1e-1); h.Draw(); .... } The error was just Processing prob1.C... Error: illegal pointer to class object h 0x0 321 FILE:/home/pytlos/usr/kret/stat33/./prob1.C LINE:90 NULL *** Interpreter error recovered *** How modify my macro? ********************* Next thing. What wrong with f.pwd()? Example below. root [0] TFile *f=new TFile("prob.root") root [1] f.ls() TFile** prob.root TFile* prob.root KEY: TDirectory top;1 top root [2] f.pwd() prob.root:/ root [3] .pwd Current directory: prob.root:/ Current style: Default root [4] top.cd() root [5] f.ls() TFile** prob.root TFile* prob.root TDirectory* top top KEY: TDirectory plane6;1 plane6 KEY: TDirectory top;1 top root [6] f.pwd() prob.root:/ root [7] .pwd Current directory: prob.root:/top Current style: Default root [8] plane6.cd() root [9] f.ls() TFile** prob.root TFile* prob.root TDirectory* top top TDirectory* plane6 plane6 ...... KEY: TH1S h12;1 h12 KEY: TDirectory plane6;1 plane6 KEY: TDirectory top;1 top root [10] f.pwd() prob.root:/ root [11] .pwd Current directory: prob.root:/top/plane6 Current style: Default root [12] Thank in advance, Tadeusz -- Tadeusz Pytlos mailto:pytlos@fizwe5.fic.uni.lodz.pl Lodz, Poland
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