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Reference Guide
mathLaplace.C File Reference

Detailed Description

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Test the TMath::LaplaceDist and TMath::LaplaceDistI functions

#include "TMath.h"
#include "TCanvas.h"
#include "TF1.h"
#include "TLegend.h"
void mathLaplace(){
TCanvas *c1=new TCanvas("c1", "TMath::LaplaceDist",600,800);
c1->Divide(1, 2);
TVirtualPad *pad1 = c1->cd(1);
pad1->SetGrid();
TF1 *flaplace = new TF1("flaplace", "TMath::LaplaceDist(x, [0], [1])", -10, 10);
flaplace->SetParameters(0, 1);
TF1 *f1 = flaplace->DrawCopy();
flaplace->SetParameters(0, 2);
TF1 *f2 = flaplace->DrawCopy("same");
f2->SetLineWidth(1);
flaplace->SetParameters(2, 1);
TF1 *f3 = flaplace->DrawCopy("same");
f3->SetLineWidth(1);
flaplace->SetParameters(2, 2);
TF1 *f4 = flaplace->DrawCopy("same");
f4->SetLineWidth(1);
TLegend *legend1 = new TLegend(.7,.7,.9,.9);
legend1->AddEntry(f1,"alpha=0 beta=1","l");
legend1->AddEntry(f2,"alpha=0 beta=2","l");
legend1->AddEntry(f3,"alpha=2 beta=1","l");
legend1->AddEntry(f4,"alpha=2 beta=2","l");
legend1->Draw();
TVirtualPad *pad2 = c1->cd(2);
pad2->SetGrid();
TF1 *flaplacei=new TF1("flaplacei", "TMath::LaplaceDistI(x, [0], [1])", -10, 10);
flaplacei->SetParameters(0, 1);
TF1 *g1=flaplacei->DrawCopy();
g1->SetLineWidth(1);
flaplacei->SetParameters(0, 2);
TF1 *g2=flaplacei->DrawCopy("same");
g2->SetLineWidth(1);
flaplacei->SetParameters(2, 1);
TF1 *g3=flaplacei->DrawCopy("same");
g3->SetLineWidth(1);
flaplacei->SetParameters(2, 2);
TF1 *g4=flaplacei->DrawCopy("same");
g4->SetLineWidth(1);
TLegend *legend2 = new TLegend(.7,.15,0.9,.35);
legend2->AddEntry(f1,"alpha=0 beta=1","l");
legend2->AddEntry(f2,"alpha=0 beta=2","l");
legend2->AddEntry(f3,"alpha=2 beta=1","l");
legend2->AddEntry(f4,"alpha=2 beta=2","l");
legend2->Draw();
c1->cd();
}
@ kRed
Definition: Rtypes.h:66
@ kGreen
Definition: Rtypes.h:66
@ kMagenta
Definition: Rtypes.h:66
@ kBlue
Definition: Rtypes.h:66
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition: TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
The Canvas class.
Definition: TCanvas.h:23
1-Dim function class
Definition: TF1.h:213
virtual TF1 * DrawCopy(Option_t *option="") const
Draw a copy of this function with its current attributes.
Definition: TF1.cxx:1364
virtual void SetParameters(const Double_t *params)
Definition: TF1.h:649
This class displays a legend box (TPaveText) containing several legend entries.
Definition: TLegend.h:23
TLegendEntry * AddEntry(const TObject *obj, const char *label="", Option_t *option="lpf")
Add a new entry to this legend.
Definition: TLegend.cxx:317
void Draw(Option_t *option="") override
Draw this legend with its current attributes.
Definition: TLegend.cxx:422
TVirtualPad is an abstract base class for the Pad and Canvas classes.
Definition: TVirtualPad.h:51
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)=0
return c1
Definition: legend1.C:41
TF1 * f1
Definition: legend1.C:11
Author
Anna Kreshuk

Definition in file mathLaplace.C.