Hi Elena, Create TChain chain1 with file1.root and file2.root, then TChain chain2 with file3.root and file4.root, then you can do chain1.Draw("x","some cut"); chain2.Draw("x","some cut","same"); where x is a variable in your tree mytree. Rene Brun On Tue, 26 Mar 2002, Elena Vataga wrote: > > > Hello rooter! > > I have set of files with TTree with I need to compare. > If I make chain: > TChain chain("mytree"); > chain.Add("file1.root"); > chain.Add("file2.root"); > > mytree->Print(); > > I need to compare it with another chain made from files file3.root and file4.root. > But all files have the same name for TTree - so > how could I distinguish between them? > > Thank you for help, > Elena >
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