ROOT   Reference Guide
mathBeta.C
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1/// \file
2/// \ingroup tutorial_math
3/// \notebook
4/// Test the TMath::BetaDist and TMath::BetaDistI functions
5///
6/// \macro_image
7/// \macro_code
8///
9/// \author Anna Kreshuk
10
11#include "TMath.h"
12#include "TCanvas.h"
13#include "TF1.h"
14#include "TLegend.h"
15
16void mathBeta() {
17 TCanvas *c1=new TCanvas("c1", "TMath::BetaDist",600,800);
18 c1->Divide(1, 2);
21 TF1 *fbeta = new TF1("fbeta", "TMath::BetaDist(x, [0], [1])", 0, 1);
22 fbeta->SetParameters(0.5, 0.5);
23 TF1 *f1 = fbeta->DrawCopy();
25 f1->SetLineWidth(1);
26 fbeta->SetParameters(0.5, 2);
27 TF1 *f2 = fbeta->DrawCopy("same");
29 f2->SetLineWidth(1);
30 fbeta->SetParameters(2, 0.5);
31 TF1 *f3 = fbeta->DrawCopy("same");
33 f3->SetLineWidth(1);
34 fbeta->SetParameters(2, 2);
35 TF1 *f4 = fbeta->DrawCopy("same");
37 f4->SetLineWidth(1);
38 TLegend *legend1 = new TLegend(.5,.7,.8,.9);
43 legend1->Draw();
44
47 TF1 *fbetai=new TF1("fbetai", "TMath::BetaDistI(x, [0], [1])", 0, 1);
48 fbetai->SetParameters(0.5, 0.5);
49 TF1 *g1=fbetai->DrawCopy();
50 g1->SetLineColor(kRed);
51 g1->SetLineWidth(1);
52 fbetai->SetParameters(0.5, 2);
53 TF1 *g2=fbetai->DrawCopy("same");
55 g2->SetLineWidth(1);
56 fbetai->SetParameters(2, 0.5);
57 TF1 *g3=fbetai->DrawCopy("same");
59 g3->SetLineWidth(1);
60 fbetai->SetParameters(2, 2);
61 TF1 *g4=fbetai->DrawCopy("same");
63 g4->SetLineWidth(1);
64
65 TLegend *legend2 = new TLegend(.7,.15,0.9,.35);
70 legend2->Draw();
71 c1->cd();
72}
@ 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.