Hi, I have a TTree composed of TClonesArray objects (TBranchClones). >From the documentation (and empirically), I noticed that is possible to refer to a specific element of my array using the [ ] operator. So, for instance, let's say my TTree has two branchs of TClonesArray called clone1 and clone2. The object clone1 has data members a1 and b1, while the object clone2 has data members a2 and b2. Now, I can do something like: myTree->Draw("clone1.a1:clone2.a2[2]") i.e., I can draw all elements a1 from clone1 as a function of the specific element a2[2] from clone2. However, that's not exactly what I want to do. Instead of drawing always a2[2] in the x-axis, I'd like to select the element of a2 with a index given by b1, i.e., b1 is a index refering to the TClonesArray clone2. So, what I'd like to do is: myTree->Draw("clone1.a1:clone2.a2[clone1.b1]") I've tried this syntax and it does not work. Unless you introduce a number between [ ], ROOT totally ignores what is inside. My question is: is there anyway to go around this limitation? I'd like also to use such thing for selection. For instance, to do something like: myTree->Draw("clone1.a1","clone2.a2[clone1.b1]>0") Maybe my problem is too specific, but if someone had similar experience, I'd apreciate any help. And I hope my explanation is not too confusing... Thanks for any help, Marcelo.
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