doc/master/ZoomHistogram_8C.html

void ZoomHistogram()

{

   TH1F *orig = new TH1F("Normal Histogram", "Normal Histogram", 100, 0, 100);


   for (int i = 0; i < 100; ++i) {

     Double_t x = gRandom->Gaus(50, 10);

     orig->Fill(x);

   }


   TH1F *zoom = (TH1F *)orig->Clone("zoom");

   zoom->SetTitle("Zoomed-in Histogram");

   zoom->GetXaxis()->SetRangeUser(50, 100);


   TCanvas *c1 = new TCanvas("c1", "Histogram", 1500, 700);

   c1->Divide(2, 1);


   c1->cd(1);

   orig->Draw();

   c1->cd(2);

   zoom->Draw();

}

Double_t
double Double_t
Definition RtypesCore.h:59

gRandom
R__EXTERN TRandom * gRandom
Definition TRandom.h:62

TAxis::SetRangeUser
virtual void SetRangeUser(Double_t ufirst, Double_t ulast)
Set the viewing range for the axis from ufirst to ulast (in user coordinates, that is,...
Definition TAxis.cxx:1080

TCanvas
The Canvas class.
Definition TCanvas.h:23

TH1F
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:621

TH1::SetTitle
void SetTitle(const char *title) override
Change/set the title.
Definition TH1.cxx:6686

TH1::GetXaxis
TAxis * GetXaxis()
Definition TH1.h:324

TH1::Fill
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition TH1.cxx:3344

TH1::Draw
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3066

TH1::Clone
TObject * Clone(const char *newname="") const override
Make a complete copy of the underlying object.
Definition TH1.cxx:2752

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

c1
return c1
Definition legend1.C:41

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