**Next message:**Thomas Bretz: "[ROOT] TH3 and Projections"**Previous message:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**In reply to:**Rene Brun: "Re: [ROOT] How to plot two dimensional histogram ?"**Next in thread:**Rene Brun: "Re: [ROOT] How to plot two dimensional histogram ?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

Hi Rene, Thanks for reply. I am trying to describe my problem in detail. Suppose I had two one dimensional histogram. Let us say: 1. Pt distribution of electron 2. Eta ditribution of electron Now, I want to plot Eta Vs. Pt of the electron. This is an example of two dimensional histogram. I followed the following steps --------------------------------------------------------------------------------------------------------- TH2F *ETA_PT = new ("ETA_PT", " Eta Vs. Pt of the electron", 1000, -2.6,2.6,100,0,40); for (i=0; i<nentries; i++) ETA_PT -> Fill(ETA, PT); ------------------------------------------------------------------------------------------------------------ When I plot the ETA_PT, the output is scatter plot. That is entries are plotted in the form of scattered point. But, I need the ETA_PT plot in the form of histogram. That is, the entries should fill in histogram. Please let me know if you need 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:**Thomas Bretz: "[ROOT] TH3 and Projections"**Previous message:**Manoj Jha: "Re: [ROOT] How to plot two dimensional histogram ?"**In reply to:**Rene Brun: "Re: [ROOT] How to plot two dimensional histogram ?"**Next in thread:**Rene Brun: "Re: [ROOT] How to plot two dimensional histogram ?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

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