doc/v632/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:66

kGreen
@ kGreen
Definition Rtypes.h:66

kMagenta
@ kMagenta
Definition Rtypes.h:66

kBlue
@ kBlue
Definition Rtypes.h:66

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358

ROOT::Detail::TRangeCast
Definition TCollection.h:311

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::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:3407

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

TPad
The most important graphics class in the ROOT system.
Definition TPad.h:28

f1
TF1 * f1
Definition legend1.C:11