doc/v636/hist034__TRatioPlot__fit__margin_8C.html

void hist034_TRatioPlot_fit_margin()

{

   gStyle->SetOptStat(0);

   auto c1 = new TCanvas("c1", "fit residual simple");

   gPad->SetFrameFillStyle(0);

   auto h1 = new TH1D("h1", "h1", 50, -5, 5);

   h1->FillRandom("gaus", 5000);

   TFitResultPtr fitres = h1->Fit("gaus", "S0");

   h1->Sumw2();

   h1->GetXaxis()->SetTitle("x");

   h1->GetYaxis()->SetTitle("y");

   auto rp1 = new TRatioPlot(h1, "errfunc");

   rp1->SetGraphDrawOpt("L");

   rp1->SetSeparationMargin(0.0);

   rp1->Draw();

   rp1->GetLowerRefGraph()->SetMinimum(-2);

   rp1->GetLowerRefGraph()->SetMaximum(2);

}

gStyle
R__EXTERN TStyle * gStyle
Definition TStyle.h:442

gPad
#define gPad
Definition TVirtualPad.h:308

ROOT::Detail::TRangeCast
Definition TCollection.h:311

TCanvas
The Canvas class.
Definition TCanvas.h:23

TFitResultPtr
Provides an indirection to the TFitResult class and with a semantics identical to a TFitResult pointe...
Definition TFitResultPtr.h:32

TH1D
1-D histogram with a double per channel (see TH1 documentation)
Definition TH1.h:925

TH1::FillRandom
virtual void FillRandom(TF1 *f1, Int_t ntimes=5000, TRandom *rng=nullptr)
Definition TH1.cxx:3500

TH1::GetXaxis
TAxis * GetXaxis()
Definition TH1.h:571

TH1::Fit
virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Double_t xmin=0, Double_t xmax=0)
Fit histogram with function fname.
Definition TH1.cxx:3876

TH1::GetYaxis
TAxis * GetYaxis()
Definition TH1.h:572

TH1::Sumw2
virtual void Sumw2(Bool_t flag=kTRUE)
Create structure to store sum of squares of weights.
Definition TH1.cxx:9016

TNamed::SetTitle
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition TNamed.cxx:174

TRatioPlot
Class for displaying ratios, differences and fit residuals.
Definition TRatioPlot.h:44

TStyle::SetOptStat
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition TStyle.cxx:1642

c1
return c1
Definition legend1.C:41

h1
TH1F * h1
Definition legend1.C:5

hist034_TRatioPlot_fit_margin
Definition hist034_TRatioPlot_fit_margin.py:1