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);
>}
>
>
This archive was generated by hypermail 2b29 : Sun Jan 02 2005 - 05:50:06 MET