Hi, 1. Have a look at TProfile. 2. Comment in Fit function reads: "// The function returns the number of selected entries." 3. Comment in TTree::Draw reads: By default the temporary histogram created is called htemp. One can retrieve a pointer to this histogram with: TH1F *htemp = (TH1F*)gPad->GetPrimitive("htemp"); Eddy > X-Authentication-Warning: pcroot.cern.ch: majordomo set sender to owner-roottalk@root.cern.ch using -f > Date: Tue, 20 Aug 2002 21:53:02 +0900 > From: Takefumi SORA <tak-sora@bg7.so-net.ne.jp> > To: Roottalk <roottalk@pcroot.cern.ch> > Subject: [ROOT] Tree Fit > MIME-Version: 1.0 > Content-Transfer-Encoding: 7bit > > Hi, > > I have three questions. > > 1. > Now I have two "Leaf". > I want to plot them 2-dimensionally and fit by "pol1". > > To plot 2-dimensionally is easy. > tree->Draw("leaf1:leaf2",cut); > > But I can not fit the 2-dimensional plot. > Please tell me how to fit. > > 2. > According to ROOT class reference, TTree::Fit funcition return > "Int_t". What does the "Int_t" parameter mean. > > 3. > In example > tree->Draw("leaf1:leaf2 >> objectA") > Must the objectA be TH class ? > > -- > Takefumi SORA <tak-sora@bg7.so-net.ne.jp> > Eddy A.J.M. Offermann Renaissance Technologies Corp. Route 25A, East Setauket NY 11733 e-mail: eddy@rentec.com http://www.rentec.com
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