Hello, Rene Brun wrote: > > Hi Malcolm, > Currently, you cannot correlate variables from different Trees > in the TTree::Draw function. This possibility will be included > in the next Root release scheduled for June. This sounds quite interesting to me ! (I would have liked to have such a possibility in the past e.g. for doing plots of data events before vs. after reprocessing etc.) > A new class (let's call it TJoinTree) will be available, eg: > TJoinTree jt("jt"); > TTree *t1, *t2, *t3; > jt.Add(t1); > jt.Add(t2); > jt.Add(t3); > jt.Draw("var1:var2:var3") > where var1, var2, var3 could be in any of t1,t2,t3. > TJoinTree deriving from TTree will have the TTree functions available. Which combinations of ntuple entries will one get in the Draw command ? All possible combinations of the ntuple entries ? e.g. like jt.Draw("t1.energy:t2.energy","t1.run_number == t2.run_number && t1.event_number == t2.event_number") ? best regards, André -- ------------------+---------------------------------- Andre Holzner | +41 22 76 76750 Bureau 32 2-C13 | Building 32 CERN | Office 2-C13 CH-1211 Geneve 23 | http://wwweth.cern.ch/~holzner/
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