Hi, Rene, Thank you very much! It works this way. But I have another question: Where to put the cut condition like abs(x)<0.2? I tried this: tree.Draw("y:x","prob","surf1","abs(x)<0.2"); tree.Draw("y:x","prob","abs(x)<0.2","surf1"); Both do not work. Thank you very much! Kai Yi On Sat, 27 Jan 2001, Rene Brun wrote: > Hi Kai, > I am not sure to understand your question. > Do you want to create a 2-d histogram of x versus y > filling eacg cell with the Prob values ? If yes, do > tree.Draw("y:x","prob","surf1"); > > Rene Brun > > On Fri, 26 Jan 2001, Kai Yi wrote: > > > Hi, Everyone, > > I have a specific question to ask, anyone can help me? > > Suppose I have a ntuple(tree), it has the following leaves: > > nEvent //trigger number > > x //x coordinate > > y //y coordinate > > z //z coordinate > > prob //some Prob. based on x,y,z > > > > I want to draw a surface picure like this: x->y->Prob > > here I need to specify the trigger no.--nEvent, about z direction, it is a > > integrate. > > I tried this from treeViewer, it draw me a 3D picture, it is point based > > picture, I want a surface picture(more smoothly). I tried to put "Surf" > > into Gopt box, it does not work. > > Anyone can help me? > > Thanks a lot > > > > > > Kai YI > > > > > > > > >
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