I have a question concerning the example program given in the description
of class TTree. In the example, a TH1F object is a branch of a
tree
// Create a ROOT Tree
TTree *tree = new TTree("T","An example of ROOT tree with a few branches");
tree->Branch("point",&point,"x:y:z");
tree->Branch("eventn",&eventn,"ntrack/I:nseg:nvertex:flag/i:temperature/F");
tree->Branch("hpx","TH1F",&hpx,128000,0);
I ran the example program and when I look at directory structure of the
root file created using TBrowser, I saw the histogram hpx and the branch
hpx inside the T tree directory. When I double click on the histogram
hpx, the histogram is plotted, but when I double click on the branch hpx,
nothing happenned. If a histogram object can be a branch of a tree, why
can't I access it from the tree directory? Why should the histogram show
up in 2 places in the directory structure? If histogram is a branch of a
tree, will the histograms be added when the same tree from different root
files are chained together using TChain?
Seng
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