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);
> >}
> >
> >
>
>
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