doc/v636/rf505__asciicfg_8C.html

#include "RooRealVar.h"

#include "RooDataSet.h"

#include "RooGaussian.h"

#include "RooPolynomial.h"

#include "RooAddPdf.h"

#include "TCanvas.h"

#include "TAxis.h"

#include "RooPlot.h"

using namespace RooFit;


void rf505_asciicfg()

{

   // C r e a t e  p d f

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


   // Construct gauss(x,m,s)

   RooRealVar x("x", "x", -10, 10);

   RooRealVar m("m", "m", 0, -10, 10);

   RooRealVar s("s", "s", 1, -10, 10);

   RooGaussian gauss("g", "g", x, m, s);


   // Construct poly(x,p0)

   RooRealVar p0("p0", "p0", 0.01, 0., 1.);

   RooPolynomial poly("p", "p", x, p0);


   // Construct model = f*gauss(x) + (1-f)*poly(x)

   RooRealVar f("f", "f", 0.5, 0., 1.);

   RooAddPdf model("model", "model", RooArgSet(gauss, poly), f);


   // F i t   m o d e l   t o   t o y   d a t a

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


   std::unique_ptr<RooDataSet> d{model.generate(x, 1000)};

   model.fitTo(*d, PrintLevel(-1));


   // W r i t e   p a r a m e t e r s   t o   a s c i i   f i l e

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


   // Obtain set of parameters

   std::unique_ptr<RooArgSet> params{model.getParameters(x)};


   // Write parameters to file

   params->writeToFile("rf505_asciicfg_example.txt");


   TString dir1 = gROOT->GetTutorialDir() ;

   dir1.Append("/roofit/rf505_asciicfg.txt") ;

   TString dir2 = "rf505_asciicfg_example.txt";


   // R e a d    p a r a m e t e r s   f r o m    a s c i i   f i l e

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


   // Read parameters from file

   params->readFromFile(dir2);

   params->Print("v");


   // Read parameters from section 'Section2' of file

   params->readFromFile(dir1, 0, "Section2");

   params->Print("v");


   // Read parameters from section 'Section3' of file. Mark all

   // variables that were processed with the "READ" attribute

   params->readFromFile(dir1, "READ", "Section3");


   // Print the list of parameters that were not read from Section3

   cout << "The following parameters of the were _not_ read from Section3: "

        << (*params->selectByAttrib("READ", false)) << endl;


   // Read parameters from section 'Section4' of file, which contains

   // 'include file' statement of rf505_asciicfg_example.txt

   // so that we effective read the same


   params->readFromFile(dir1, 0, "Section4");

   params->Print("v");

}

d
#define d(i)
Definition RSha256.hxx:102

f
#define f(i)
Definition RSha256.hxx:104

RooAddPdf.h

RooDataSet.h

RooGaussian.h

RooPlot.h

RooPolynomial.h

RooRealVar.h

TAxis.h

TCanvas.h

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

gROOT
#define gROOT
Definition TROOT.h:414

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

RooAddPdf
Efficient implementation of a sum of PDFs of the form.
Definition RooAddPdf.h:33

RooArgSet
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition RooArgSet.h:24

RooGaussian
Plain Gaussian p.d.f.
Definition RooGaussian.h:24

RooPolynomial
RooPolynomial implements a polynomial p.d.f of the form.
Definition RooPolynomial.h:25

RooRealVar
Variable that can be changed from the outside.
Definition RooRealVar.h:37

TString
Basic string class.
Definition TString.h:139

x
Double_t x[n]
Definition legend1.C:17

RooFit
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition CodegenImpl.h:65

rf505_asciicfg
Definition rf505_asciicfg.py:1

m
TMarker m
Definition textangle.C:8