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Reference Guide
th2polyHoneycomb.C
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1 /// \file
2 /// \ingroup tutorial_hist
3 /// \notebook -js
4 /// This tutorial illustrates how to create an histogram with hexagonal
5 /// bins (TH2Poly). The method TH2Poly::Honeycomb allows to build automatically
6 /// an honeycomb binning.
7 ///
8 /// \macro_code
9 /// \macro_image
10 ///
11 /// \author Olivier Couet
12 
13 void th2polyHoneycomb(){
14  TH2Poly *hc = new TH2Poly();
15  hc->SetTitle("Honeycomb example");
16  hc->Honeycomb(0,0,.1,25,25);
17 
18  TRandom ran;
19  for (int i = 0; i<30000; i++) {
20  hc->Fill(ran.Gaus(2.,1), ran.Gaus(2.,1));
21  }
22 
23  hc->Draw("colz");
24 }
TRandom::Gaus
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition: TRandom.cxx:274
TH1::SetTitle
virtual void SetTitle(const char *title)
See GetStatOverflows for more information.
Definition: TH1.cxx:6678
TRandom
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27
TH2Poly::Honeycomb
void Honeycomb(Double_t xstart, Double_t ystart, Double_t a, Int_t k, Int_t s)
Bins the histogram using a honeycomb structure.
Definition: TH2Poly.cxx:938
TH2Poly::Fill
virtual Int_t Fill(Double_t x, Double_t y)
Increment the bin containing (x,y) by 1.
Definition: TH2Poly.cxx:589
TH2Poly
2D Histogram with Polygonal Bins
Definition: TH2Poly.h:66
TH1::Draw
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:3073