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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