[ROOT] closing TTree files

From: Dr. John Krane (jkrane@netzero.com)
Date: Thu Jul 17 2003 - 23:36:10 MEST 

Hi,

I want to open a Tree, loop over it creating histograms, close the histo 
file, close the Tree.  Without leaving Root, I want to repeat the entire 
process with a different Tree and make a separate histo file.

I have most of what I need I think, but I don't know how to close the 
Tree when I'm done with it.  I do:

    // Write histos to disk.  Close all files.
    histofile->Write();
    histofile->Close();
    delete histofile;

    fChain->Delete();

And this works as I expect with the histofile but not with the Tree.  I 
get through my loop twice and then seg fault.  When I check the 
TBrowser, I see both the first and second trees in there, which would 
cause a seg fault in my code all right.  Can anybody tell me how to get 
rid of the first Tree?

	- John

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