doc/v606/rf302__utilfuncs_8C.html

#ifndef __CINT__

#include "RooGlobalFunc.h"

#endif

#include "RooRealVar.h"

#include "RooDataSet.h"

#include "RooGaussian.h"

#include "TCanvas.h"

#include "TAxis.h"

#include "RooPlot.h"

#include "RooFormulaVar.h"

#include "RooAddition.h"

#include "RooProduct.h"

#include "RooPolyVar.h"

#include "TCanvas.h"

#include "TAxis.h"

#include "TH1.h"


using namespace RooFit ;


void rf302_utilfuncs()

{

  // C r e a t e   o b s e r v a b l e s ,   p a r a m e t e r s

  // -----------------------------------------------------------


  // Create observables

  RooRealVar x("x","x",-5,5) ;

  RooRealVar y("y","y",-5,5) ;


  // Create parameters

  RooRealVar a0("a0","a0",-1.5,-5,5) ;

  RooRealVar a1("a1","a1",-0.5,-1,1) ;

  RooRealVar sigma("sigma","width of gaussian",0.5) ;


  // U s i n g   R o o F o r m u l a V a r   t o   t a i l o r   p d f

  // -----------------------------------------------------------------------


  // Create interpreted function f(y) = a0 - a1*sqrt(10*abs(y))

  RooFormulaVar fy_1("fy_1","a0-a1*sqrt(10*abs(y))",RooArgSet(y,a0,a1)) ;


  // Create gauss(x,f(y),s)

  RooGaussian model_1("model_1","Gaussian with shifting mean",x,fy_1,sigma) ;


  // U s i n g   R o o P o l y V a r   t o   t a i l o r   p d f

  // -----------------------------------------------------------------------


  // Create polynomial function f(y) = a0 + a1*y

  RooPolyVar fy_2("fy_2","fy_2",y,RooArgSet(a0,a1)) ;


  // Create gauss(x,f(y),s)

  RooGaussian model_2("model_2","Gaussian with shifting mean",x,fy_2,sigma) ;


  // U s i n g   R o o A d d i t i o n   t o   t a i l o r   p d f

  // -----------------------------------------------------------------------


  // Create sum function f(y) = a0 + y

  RooAddition fy_3("fy_3","a0+y",RooArgSet(a0,y)) ;


  // Create gauss(x,f(y),s)

  RooGaussian model_3("model_3","Gaussian with shifting mean",x,fy_3,sigma) ;


  // U s i n g   R o o P r o d u c t   t o   t a i l o r   p d f

  // -----------------------------------------------------------------------


  // Create product function f(y) = a1*y

  RooProduct fy_4("fy_4","a1*y",RooArgSet(a1,y)) ;


  // Create gauss(x,f(y),s)

  RooGaussian model_4("model_4","Gaussian with shifting mean",x,fy_4,sigma) ;


  // P l o t   a l l   p d f s

  // ----------------------------


  // Make two-dimensional plots in x vs y

  TH1* hh_model_1 = model_1.createHistogram("hh_model_1",x,Binning(50),YVar(y,Binning(50))) ;

  TH1* hh_model_2 = model_2.createHistogram("hh_model_2",x,Binning(50),YVar(y,Binning(50))) ;

  TH1* hh_model_3 = model_3.createHistogram("hh_model_3",x,Binning(50),YVar(y,Binning(50))) ;

  TH1* hh_model_4 = model_4.createHistogram("hh_model_4",x,Binning(50),YVar(y,Binning(50))) ;

  hh_model_1->SetLineColor(kBlue) ;

  hh_model_2->SetLineColor(kBlue) ;

  hh_model_3->SetLineColor(kBlue) ;

  hh_model_4->SetLineColor(kBlue) ;


  // Make canvas and draw RooPlots

  TCanvas *c = new TCanvas("rf302_utilfuncs","rf302_utilfuncs",800, 800);

  c->Divide(2,2);

  c->cd(1) ; gPad->SetLeftMargin(0.20) ; hh_model_1->GetZaxis()->SetTitleOffset(2.5) ; hh_model_1->Draw("surf") ;

  c->cd(2) ; gPad->SetLeftMargin(0.20) ; hh_model_2->GetZaxis()->SetTitleOffset(2.5) ; hh_model_2->Draw("surf") ;

  c->cd(3) ; gPad->SetLeftMargin(0.20) ; hh_model_3->GetZaxis()->SetTitleOffset(2.5) ; hh_model_3->Draw("surf") ;

  c->cd(4) ; gPad->SetLeftMargin(0.20) ; hh_model_4->GetZaxis()->SetTitleOffset(2.5) ; hh_model_4->Draw("surf") ;


}