doc/v622/ratioplot6_8C.html

void ratioplot6() {

   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:410

gPad
#define gPad
Definition: TVirtualPad.h:287

TCanvas
The Canvas class.
Definition: TCanvas.h:27

TFitResultPtr
Provides an indirection to the TFitResult class and with a semantics identical to a TFitResult pointe...
Definition: TFitResultPtr.h:31

TH1D
1-D histogram with a double per channel (see TH1 documentation)}
Definition: TH1.h:614

TH1::FillRandom
virtual void FillRandom(const char *fname, Int_t ntimes=5000)
Fill histogram following distribution in function fname.
Definition: TH1.cxx:3445

TH1::GetXaxis
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:316

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:3808

TH1::GetYaxis
TAxis * GetYaxis()
Definition: TH1.h:317

TH1::Sumw2
virtual void Sumw2(Bool_t flag=kTRUE)
Create structure to store sum of squares of weights.
Definition: TH1.cxx:8476

TNamed::SetTitle
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition: TNamed.cxx:164

TRatioPlot
Class for displaying ratios, differences and fit residuals.
Definition: TRatioPlot.h:43

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:1590

c1
return c1
Definition: legend1.C:41

h1
TH1F * h1
Definition: legend1.C:5

ratioplot6
Definition: ratioplot6.py:1