doc/v632/mathBeta_8C.html

#include "TMath.h"

#include "TCanvas.h"

#include "TF1.h"

#include "TLegend.h"


void mathBeta() {

   TCanvas *c1=new TCanvas("c1", "TMath::BetaDist",600,800);

   c1->Divide(1, 2);

   TVirtualPad *pad1 = c1->cd(1);

   pad1->SetGrid();

   TF1 *fbeta = new TF1("fbeta", "TMath::BetaDist(x, [0], [1])", 0, 1);

   fbeta->SetParameters(0.5, 0.5);

   TF1 *f1 = fbeta->DrawCopy();

   f1->SetLineColor(kRed);

   f1->SetLineWidth(1);

   fbeta->SetParameters(0.5, 2);

   TF1 *f2 = fbeta->DrawCopy("same");

   f2->SetLineColor(kGreen);

   f2->SetLineWidth(1);

   fbeta->SetParameters(2, 0.5);

   TF1 *f3 = fbeta->DrawCopy("same");

   f3->SetLineColor(kBlue);

   f3->SetLineWidth(1);

   fbeta->SetParameters(2, 2);

   TF1 *f4 = fbeta->DrawCopy("same");

   f4->SetLineColor(kMagenta);

   f4->SetLineWidth(1);

   TLegend *legend1 = new TLegend(.5,.7,.8,.9);

   legend1->AddEntry(f1,"p=0.5  q=0.5","l");

   legend1->AddEntry(f2,"p=0.5  q=2","l");

   legend1->AddEntry(f3,"p=2    q=0.5","l");

   legend1->AddEntry(f4,"p=2    q=2","l");

   legend1->Draw();


   TVirtualPad *pad2 = c1->cd(2);

   pad2->SetGrid();

   TF1 *fbetai=new TF1("fbetai", "TMath::BetaDistI(x, [0], [1])", 0, 1);

   fbetai->SetParameters(0.5, 0.5);

   TF1 *g1=fbetai->DrawCopy();

   g1->SetLineColor(kRed);

   g1->SetLineWidth(1);

   fbetai->SetParameters(0.5, 2);

   TF1 *g2=fbetai->DrawCopy("same");

   g2->SetLineColor(kGreen);

   g2->SetLineWidth(1);

   fbetai->SetParameters(2, 0.5);

   TF1 *g3=fbetai->DrawCopy("same");

   g3->SetLineColor(kBlue);

   g3->SetLineWidth(1);

   fbetai->SetParameters(2, 2);

   TF1 *g4=fbetai->DrawCopy("same");

   g4->SetLineColor(kMagenta);

   g4->SetLineWidth(1);


   TLegend *legend2 = new TLegend(.7,.15,0.9,.35);

   legend2->AddEntry(f1,"p=0.5  q=0.5","l");

   legend2->AddEntry(f2,"p=0.5  q=2","l");

   legend2->AddEntry(f3,"p=2    q=0.5","l");

   legend2->AddEntry(f4,"p=2    q=2","l");

   legend2->Draw();

   c1->cd();

}

kRed
@ kRed
Definition Rtypes.h:66

kGreen
@ kGreen
Definition Rtypes.h:66

kMagenta
@ kMagenta
Definition Rtypes.h:66

kBlue
@ kBlue
Definition Rtypes.h:66

TCanvas.h

TF1.h

TLegend.h

TMath.h

TAttLine::SetLineWidth
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition TAttLine.h:43

TAttLine::SetLineColor
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:40

TCanvas
The Canvas class.
Definition TCanvas.h:23

TF1
1-Dim function class
Definition TF1.h:233

TF1::DrawCopy
virtual TF1 * DrawCopy(Option_t *option="") const
Draw a copy of this function with its current attributes.
Definition TF1.cxx:1365

TF1::SetParameters
virtual void SetParameters(const Double_t *params)
Definition TF1.h:670

TLegend
This class displays a legend box (TPaveText) containing several legend entries.
Definition TLegend.h:23

TLegend::AddEntry
TLegendEntry * AddEntry(const TObject *obj, const char *label="", Option_t *option="lpf")
Add a new entry to this legend.
Definition TLegend.cxx:317

TLegend::Draw
void Draw(Option_t *option="") override
Draw this legend with its current attributes.
Definition TLegend.cxx:422

TVirtualPad
TVirtualPad is an abstract base class for the Pad and Canvas classes.
Definition TVirtualPad.h:51

TVirtualPad::SetGrid
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)=0

TVirtualPad::cd
virtual TVirtualPad * cd(Int_t subpadnumber=0)=0

c1
return c1
Definition legend1.C:41

f1
TF1 * f1
Definition legend1.C:11