**Next message:**Edmond Offermann: "Re: [ROOT] available functions in root"**Previous message:**Rene Brun: "Re: [ROOT] Run on PROOF the h1analysis.C from Example Analysis of User Guide V3.10"**In reply to:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**Next in thread:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

Hi, I am still not sure to understand your request. By default, a 2-D histogram is drawn as a scatter plot. You can choose different draw options, eg h->Draw("lego"). See list of options at: http://root.cern.ch/root/htmldoc/THistPainter.html#THistPainter:Paint Rene Brun On Thu, 18 Mar 2004, Manoj Jha wrote: > Hi Rene, > Thanks for reply. I am trying to describe my problem in detail. > Suppose I have two one dimensional histogram, i.e., > > 1. One dimensionalm Pt distribution of electron > 2. One dimensional Eta distribution of electron. > > Now, I want to plot Eta vs. Pt of the electron. For this purpose, I have > to create a new two dimensional histogram as > -------------------------------------------------------------------------------------------------------------------- > TH2F *Eta_Pt = new ("Eta_Pt" , " Eta Vs. Pt of the electron", > 100,-2.6,2.6,100,0,40); > > for (Int_t i=0; i<nentries; i++ ) > Eta_Pt ->Fill(Eta, Pt); > -------------------------------------------------------------------------------------------------------------------- > > The output of the above script is in the form of scatter plot. That is > the entries has been plotted as scattered point. Since by default, 2D > histograms are drawn as scatter plots. Thats why I am getting scatter > plot. But I need the plot (Eta_Pt) in the form of histogram. Please > let me know if you need any more informations. > > Thanks and with regards, > manoj > > > > > > Rene Brun wrote: > > >Hi, > > > >I am not sure to understand correctly your request. > >The example in the attachement will may be give you some hints. > > > >Rene Brun > > > >Manoj Jha wrote: > > > > > >>Dear Rooters, > >> I have two one dimensional histograms. I want to plot theses two one > >>dimenasional histograms as one two dimensional histogram. For this > >>purpose, I used TH2F to create the two dimensional histogram. When using > >>TH2F, I am getting scatter plot. But, I need the two dimensional plot in > >>the form of hitogram instead of scatter plot. Please let me know if you > >>have solution for it. > >> > >>With best wishes, > >>manoj jha > >> > >> > >> > > > >------------------------------------------------------------------------ > > > >void manoj() { > > TCanvas *c1 = new TCanvas("c1","c1",600,900); > > c1->Divide(1,2); > > //method 1 > > c1->cd(1); > > gPad->SetFrameFillColor(41); > > gPad->SetTheta(1.97); > > gPad->SetPhi(2.60); > > TH2F *h = new TH2F("h","test",30,-3,3,2,0,2); > > h->SetFillColor(38); > > h->GetYaxis()->SetNdivisions(2); > > TRandom r; > > for (int i=0;i<1000;i++) { > > h->Fill(1.3*r.Gaus(1,0.8),0.5); > > h->Fill(1.0*r.Gaus(-1,1),1.5,1.2); > > } > > h->Draw("lego1"); > > > > //method2 > > c1->cd(2); > > gPad->SetFrameFillColor(41); > > gPad->SetTheta(1.97); > > gPad->SetPhi(2.60); > > TH2F *h1 = new TH2F("h1","test",30,-3,3,2,0,2); > > TH2F *h2 = new TH2F("h2","test",30,-3,3,2,0,2); > > h1->SetFillColor(38); > > h2->SetFillColor(50); > > for (int i=0;i<1000;i++) { > > h1->Fill(1.3*r.Gaus(1,0.8),0.5); > > h2->Fill(1.0*r.Gaus(-1,1),1.5,1.2); > > } > > THStack *s = new THStack("s","test"); > > s->Add(h1,"lego1"); > > s->Add(h2,"lego1"); > > s->Draw(); > > s->GetYaxis()->SetNdivisions(2); > >} > > > > > >

**Next message:**Edmond Offermann: "Re: [ROOT] available functions in root"**Previous message:**Rene Brun: "Re: [ROOT] Run on PROOF the h1analysis.C from Example Analysis of User Guide V3.10"**In reply to:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**Next in thread:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

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