doc/v636/hist018__TH2__cutg_8C.html

void hist018_TH2_cutg()

{

   const int n = 6;

   Float_t x[6] = {1, 2, 1, -1, -2, -1};

   Float_t y[6] = {2, 0, -2, -2, 0, 2};

   TCutG *cut = new TCutG("cut", 6, x, y);

   TH2F *hist = new TH2F("hist", "Histogram with cut", 40, -10., 10., 40, -10., 10.);

   for (int i = 0; i < 100000; i++)

      hist->Fill(gRandom->Gaus(0., 3.), gRandom->Gaus(0., 3.));

   TCanvas *c1 = new TCanvas("c1", "Histogram draw with TCutG", 600, 900);

   hist->Draw("col [cut]");

   cut->Draw("l");

}

Float_t
float Float_t
Definition RtypesCore.h:57

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358

gRandom
R__EXTERN TRandom * gRandom
Definition TRandom.h:62

TCanvas
The Canvas class.
Definition TCanvas.h:23

TCutG
Graphical cut class.
Definition TCutG.h:20

TGraph::Draw
void Draw(Option_t *chopt="") override
Draw this graph with its current attributes.
Definition TGraph.cxx:833

TH1::Draw
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3038

TH2F
2-D histogram with a float per channel (see TH1 documentation)
Definition TH2.h:307

TH2::Fill
Int_t Fill(Double_t) override
Invalid Fill method.
Definition TH2.cxx:357

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:275

y
Double_t y[n]
Definition legend1.C:17

c1
return c1
Definition legend1.C:41

x
Double_t x[n]
Definition legend1.C:17

n
const Int_t n
Definition legend1.C:16