I've some problem with filling predefined histograms from ntuples
(projecting ntuples into histograms):
my_ntuple->Draw("some_quantity >> my_histo", "some_selection")
seems to use ONLY selfdefined temporary histograms. When I tried to
instantiate the histogram before it is used in the command above,
nothing happens (I can't Draw() the histogram afterwards: canvas stays
empty). I would like to use predefined histograms to get a special
binning.
Also the command
my_ntuple->Project("my_histo", "some_quantity", "some_selection")
does not work in that way, albeit there is some indication from the
(at this point vague) documentation that it should.
And another question: Should Project() work like ntuple/project in
Paw, e.g. the projection is only _added_ to the histogram contents (no
reset)?
I've tried with 1.03/01 for AIX 4.1 and 1.02/00 for Solaris 2.4.
Tschuess, Thomas Kraemerkaemper.