Hi Lesley, One possibility is: TChain myChain("TreeName"); myChain.Add("Firstfile.root"); myChain.Add("Secondfile.root"); .......... This Chains your root files(you can extend this) Then to see the content of the chain, ..... TreeName->StartViewer(); I did this and its working for me, in root[] session (and compile code) There is a detailed discussion of this in the root user's manual and it is very helpful. you can download it at the root website. Hope this helps. Keep trying... Zaldy > I have two root files (which can be loaded with TFile and TTree) > containing the same types of variables but of course different valuse. > If I want to use TChain to chain them up so that I can do calculations > by extracting the same type of variable from the two files (eg, find the > sum of a particular variable from a file and the same var from another > file), how to create such a Chain? And if I get such a chain of the two > file, can I plot histograms with the chain in the same way I do using a > single TTree file? > > Thank you very much! > > Lesley > -- -------------------------------------------------------- Zaldy A. Nawang PS Users Room 2 Yon Gokan, E362, Neutrino Group, IPNS, KEK, Japan e-mail: zaldy@neutrino.kek.jp Tel. No. : (81) 029864 - 5387 --------------------------------------------------------
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