Dott. Pappalardo G.S. wrote: > > Dear ROOTers, > > I need to know how to condition a variable belonging to a branch of a tree > with a variable belonging to another branch. > For example: I ha a variable a belonging to branch A and a variable b > belonging to a branch B. I need for example, the spectrum of variable a > when b>0. > Any help will be appreciated > thanks > Giuseppe Pappalardo Hi Giuseppe, Have a look at URL: http://root.cern.ch/root/HowtoReadTree.html simply do: tree->Draw("a","b>0") Rene Brun
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