Hi, if in the following macro (which has been stolen from the ROOT class manual) I change gr->Draw("AP") into gr->Draw("A") or gr->Draw("P") nothing happens on the screen except a segment is drawn on the right side of the canvas. Is it a supposed behaviour? -------------------------------------------------------------------------------- { gROOT->Reset(); gStyle->SetFillColor(0); graph = new TCanvas("graph","A Simple Graph with error bars",200,10,700,500); Int_t n = 10; Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95}; Float_t y[n] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1}; Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05}; Float_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8}; gr = new TGraphErrors(n,x,y,ex,ey); gr->SetTitle("TGraphErrors Example"); gr->SetMarkerColor(1); gr->SetMarkerStyle(20); gr->Draw("AP"); graph->Update(); } -------------------------------------------------------------------------------- Another relevant question: I need to superimpose 2 sets of experimental points. To do this in PAW one uses the following command sequence: > hplot/null ..... * define dimensions of the plot > hplot/err .... * plot 1st set of points > hplot/err .... * plot 2nd set of points What is the equivalent command sequence of ROOT commands ? It would be very helpful to include an example of how to do this into ROOT manual/tutorials - this is one of the very basic things people are doing. Thanks, Pasha
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