TTree::Draw("???")

From: William J. Deninger (deninger@uiuc.edu)
Date: Sun Jan 04 1998 - 01:45:58 MET 

Hello,

How do I Draw a "Run_number" histogram in a TTree if I have used the
following to book it?  Is there a way similar to TNtuple, that being without
needing to write a bunch of code to sort through the tree and book into a
hist?

class Event: public TObject
{
    EventHeader header;
......
}
class EventHeader : public TObject
{
    UInt_t Run_number;
......
}

{
Event *event = new Event;
TTree *t = new TTree("tree","example tree");
tree->Branch("event","Event",&event,32000,0);
for (Int_t i=0; i<100; i++)
    {
    event->Run_number = i;
    t->Fill();
    }
}

William J Deninger
deninger@uiuc.edu

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