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Reference Guide
ratioplot6.C File Reference
Tutorials » Histograms tutorials

Detailed Description

View in nbviewer Open in SWAN Example showing a fit residual plot, where the separation margin has been set to 0.

The last label of the lower plot's y axis is hidden automatically.

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:407
gPad
#define gPad
Definition: TVirtualPad.h:286
TCanvas
The Canvas class.
Definition: TCanvas.h:31
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:8464
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:1450
c1
return c1
Definition: legend1.C:41
h1
TH1F * h1
Definition: legend1.C:5
Author
Paul Gessinger

Definition in file ratioplot6.C.