doc/v618/mathGammaNormal_8C.html

void mathGammaNormal(){

   TCanvas *myc = new TCanvas("c1","gamma and lognormal",10,10,600,800);

   myc->Divide(1,2);

   TPad *pad1 = (TPad *)myc->cd(1);

   pad1->SetLogy();

   pad1->SetGrid();


   //TMath::GammaDist

   TF1 *fgamma = new TF1("fgamma", "TMath::GammaDist(x, [0], [1], [2])", 0, 10);

   fgamma->SetParameters(0.5, 0, 1);

   TF1 *f1 = fgamma->DrawCopy();

   f1->SetMinimum(1e-5);

   f1->SetLineColor(kRed);

   fgamma->SetParameters(1, 0, 1);

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

   f2->SetLineColor(kGreen);

   fgamma->SetParameters(2, 0, 1);

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

   f3->SetLineColor(kBlue);

   fgamma->SetParameters(5, 0, 1);

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

   f4->SetLineColor(kMagenta);

   TLegend *legend1 = new TLegend(.2,.15,.5,.4);

   legend1->AddEntry(f1,"gamma = 0.5 mu = 0  beta = 1","l");

   legend1->AddEntry(f2,"gamma = 1   mu = 0  beta = 1","l");

   legend1->AddEntry(f3,"gamma = 2   mu = 0  beta = 1","l");

   legend1->AddEntry(f4,"gamma = 5   mu = 0  beta = 1","l");

   legend1->Draw();


   //TMath::LogNormal

   TPad *pad2 = (TPad *)myc->cd(2);

   pad2->SetLogy();

   pad2->SetGrid();

   TF1 *flog = new TF1("flog", "TMath::LogNormal(x, [0], [1], [2])", 0, 5);

   flog->SetParameters(0.5, 0, 1);

   TF1 *g1 = flog->DrawCopy();

   g1->SetLineColor(kRed);

   flog->SetParameters(1, 0, 1);

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

   g2->SetLineColor(kGreen);

   flog->SetParameters(2, 0, 1);

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

   g3->SetLineColor(kBlue);

   flog->SetParameters(5, 0, 1);

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

   g4->SetLineColor(kMagenta);

   TLegend *legend2 = new TLegend(.2,.15,.5,.4);

   legend2->AddEntry(g1,"sigma = 0.5 theta = 0  m = 1","l");

   legend2->AddEntry(g2,"sigma = 1   theta = 0  m = 1","l");

   legend2->AddEntry(g3,"sigma = 2   theta = 0  m = 1","l");

   legend2->AddEntry(g4,"sigma = 5   theta = 0  m = 1","l");

   legend2->Draw();

}


e
#define e(i)
Definition: RSha256.hxx:103

kRed
@ kRed
Definition: Rtypes.h:64

kGreen
@ kGreen
Definition: Rtypes.h:64

kMagenta
@ kMagenta
Definition: Rtypes.h:64

kBlue
@ kBlue
Definition: Rtypes.h:64

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

TCanvas
The Canvas class.
Definition: TCanvas.h:31

TCanvas::cd
TVirtualPad * cd(Int_t subpadnumber=0)
Set current canvas & pad.
Definition: TCanvas.cxx:693

TF1
1-Dim function class
Definition: TF1.h:211

TF1::SetMinimum
virtual void SetMinimum(Double_t minimum=-1111)
Set the minimum value along Y for this function In case the function is already drawn,...
Definition: TF1.cxx:3406

TF1::DrawCopy
virtual TF1 * DrawCopy(Option_t *option="") const
Draw a copy of this function with its current attributes.
Definition: TF1.cxx:1347

TF1::SetParameters
virtual void SetParameters(const Double_t *params)
Definition: TF1.h:638

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:330

TLegend::Draw
virtual void Draw(Option_t *option="")
Draw this legend with its current attributes.
Definition: TLegend.cxx:423

TPad
The most important graphics class in the ROOT system.
Definition: TPad.h:29

TPad::Divide
virtual void Divide(Int_t nx=1, Int_t ny=1, Float_t xmargin=0.01, Float_t ymargin=0.01, Int_t color=0)
Automatic pad generation by division.
Definition: TPad.cxx:1166

TPad::SetLogy
virtual void SetLogy(Int_t value=1)
Set Lin/Log scale for Y.
Definition: TPad.cxx:5856

TPad::SetGrid
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)
Definition: TPad.h:328

f1
TF1 * f1
Definition: legend1.C:11