Hi. I'm producing a postscript file containing many pages, each with nine plots in it. Each plot is the outcome of using TGraphErrors. Now, for each plot, I would like to draw a line at a fixed x range (xmin and xmax are known constants), but at a different y range (ymin and ymax change from plot to plot). I've tried to use ComputeRange method of TGraphErrors with no success, see below please.... Am I doing something wrong? //========================================== float* afMoment = new float[nEntries]; float* afErrMoment = new float[nEntries]; float* afMass = new float[nEntries]; float* afErrMass = new float[nEntries]; ..... .... // inside a loop .... TGraphErrors *gr = new TGraphErrors(nEntries, afMass, afMoment, afErrMass, afErrMoment); gr->SetTitle(szMom); gr->Draw("ap"); gr->GetXaxis()->SetTitle("m ( #omega #pi^{-} ) [MeV]"); gr->Draw("ap"); Double_t min_mass, min_h, max_mass, max_h; gr->ComputeRange(min_mass, min_h, max_mass, max_h); cout << "min_h: " << min_h << "max_h: ' << max_h << endl; ====> this line prints zero for min_h and min_max ???? why? TLine *line1= new TLine(1235,min_h,1235,max_h); line1->Draw(); //========================================= Thanks, mina -- Mina Nozar nozarm@jlab.org ----- Phone:(757)269-6391 ----- FAX:(757)269-5800 Thomas Jefferson National Accelerator Facility MS 12H, 12000 Jefferson Ave. Newport News, VA 23606
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