TTree::GetMinimum()

Oliver Mang (mang@ifkas1.ifkhep.uni-kiel.de)
Fri, 7 May 1999 03:32:04 +0200 (MET DST)

Dear ROOTers,
I found an odd behaviour of TTree::GetMinimum() (ROOT 2.21.08/SUSe Linux
6.1) :
root [48] .p cr_on.GetMaximum("mjd");
(Float_t)5.117500000000e+04
root [49] .p cr_on.GetMinimum("mjd");
(Float_t)5.116100000000e+04
root [50] .p cr_on.GetEstimate();
(Int_t)1019098
root [51] cr_on.Draw("mjd");

The resulting histogram however has entries ranging from 50855 to 51175.
cr_on is a TChain, I have used
cr_on.SetEstimate(cr_on.GetEntries());
and all other histograms (created via TTree::Draw() ) are fine. Seems that
TTree::GetMinimum() gives a wrong result. I have also tried Macros based
on the ROOT source code, they show the same behaviour.

Is it my fault (somehow) or is it bug ?
Any help is appreciated,
Oliver

--
Oliver Mang
Institut fuer Experimentelle und Angewandte Physik, CAU Kiel
Phone: ++49/431/880-2482	E-Mail: mang@ifkhep.uni-kiel.de
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