Hi Agnes, A short example showing how to do what you want. Output gif file is in the attachement. You can produce the cernstaff.root file by running the tutorial cernstaff.C in root 3.02/07 void bigpm() { TFile *f = new TFile("cernstaff.root"); TTree *T = (TTree*)f->Get("T"); TCanvas *c1 = new TCanvas("c1"); T->Draw("Cost:Age>>hist","","goff"); TH2F *h = new TH2F("h","Cost vs Age",60,10,70,20,0,20000); h->Draw(); c1->Update(); T->SetMarkerStyle(3); T->SetMarkerColor(3); T.Draw("Cost:Age","Grade==3","same"); T->SetMarkerColor(4); T.Draw("Cost:Age","Grade==4","same"); T->SetMarkerColor(5); T.Draw("Cost:Age","Grade==5","same"); T->SetMarkerColor(6); T.Draw("Cost:Age","Grade==6","same"); T->SetMarkerColor(1); T.Draw("Cost:Age","Grade==10","same"); T->SetMarkerColor(2); T.Draw("Cost:Age","Grade==12","same"); } Rene Brun Agnes Lundborg wrote: > > Hi > I have a set of x,y values which each have an assigned z-value. From > this I would like to get a 2d scatter plot with colored points which are > pretty big, that is a star or something, not just a dot. The color would > correspond to the value of z and their position in the 2d scatter plot > to the x and y values. I absolute do not want different x and y's to > contribute to the same point which I would get if I use > profilehistograms or if I do ntuple->Draw("y:x","z"); > How would I do this? > Agnes
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