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rf203_ranges.C
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1 /// \file
2 /// \ingroup tutorial_roofit
3 /// \notebook -js
4 /// Fitting and plotting in sub ranges.
5 ///
6 /// \macro_image
7 /// \macro_output
8 /// \macro_code
9 ///
10 /// \date July 2008
11 /// \author Wouter Verkerke
12 
13 #include "RooRealVar.h"
14 #include "RooDataSet.h"
15 #include "RooGaussian.h"
16 #include "RooConstVar.h"
17 #include "RooPolynomial.h"
18 #include "RooAddPdf.h"
19 #include "RooFitResult.h"
20 #include "RooPlot.h"
21 #include "TCanvas.h"
22 #include "TAxis.h"
23 #include "TH1.h"
24 using namespace RooFit;
25 
26 void rf203_ranges()
27 {
28  // S e t u p m o d e l
29  // ---------------------
30 
31  // Construct observables x
32  RooRealVar x("x", "x", -10, 10);
33 
34  // Construct gaussx(x,mx,1)
35  RooRealVar mx("mx", "mx", 0, -10, 10);
36  RooGaussian gx("gx", "gx", x, mx, RooConst(1));
37 
38  // Construct px = 1 (flat in x)
39  RooPolynomial px("px", "px", x);
40 
41  // Construct model = f*gx + (1-f)px
42  RooRealVar f("f", "f", 0., 1.);
43  RooAddPdf model("model", "model", RooArgList(gx, px), f);
44 
45  // Generated 10000 events in (x,y) from pdf model
46  RooDataSet *modelData = model.generate(x, 10000);
47 
48  // F i t f u l l r a n g e
49  // ---------------------------
50 
51  // Fit pdf to all data
52  RooFitResult *r_full = model.fitTo(*modelData, Save(kTRUE));
53 
54  // F i t p a r t i a l r a n g e
55  // ----------------------------------
56 
57  // Define "signal" range in x as [-3,3]
58  x.setRange("signal", -3, 3);
59 
60  // Fit pdf only to data in "signal" range
61  RooFitResult *r_sig = model.fitTo(*modelData, Save(kTRUE), Range("signal"));
62 
63  // P l o t / p r i n t r e s u l t s
64  // ---------------------------------------
65 
66  // Make plot frame in x and add data and fitted model
67  RooPlot *frame = x.frame(Title("Fitting a sub range"));
68  modelData->plotOn(frame);
69  model.plotOn(frame, Range("Full"), LineStyle(kDashed), LineColor(kRed)); // Add shape in full ranged dashed
70  model.plotOn(frame); // By default only fitted range is shown
71 
72  // Print fit results
73  cout << "result of fit on all data " << endl;
74  r_full->Print();
75  cout << "result of fit in in signal region (note increased error on signal fraction)" << endl;
76  r_sig->Print();
77 
78  // Draw frame on canvas
79  new TCanvas("rf203_ranges", "rf203_ranges", 600, 600);
80  gPad->SetLeftMargin(0.15);
81  frame->GetYaxis()->SetTitleOffset(1.4);
82  frame->Draw();
83 
84  return;
85 }
RooPlot::Draw
virtual void Draw(Option_t *options=0)
Draw this plot and all of the elements it contains.
Definition: RooPlot.cxx:691
kTRUE
const Bool_t kTRUE
Definition: RtypesCore.h:91
RooAddPdf
RooAddPdf is an efficient implementation of a sum of PDFs of the form.
Definition: RooAddPdf.h:32
f
#define f(i)
Definition: RSha256.hxx:104
RooArgList
RooArgList is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgList.h:21
RooGaussian.h
rf203_ranges
Definition: rf203_ranges.py:1
x
Double_t x[n]
Definition: legend1.C:17
RooGaussian
Plain Gaussian p.d.f.
Definition: RooGaussian.h:24
RooAddPdf.h
TCanvas.h
RooDataSet.h
RooFitResult
RooFitResult is a container class to hold the input and output of a PDF fit to a dataset.
Definition: RooFitResult.h:40
RooPolynomial.h
RooFit
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition: RooCFunction1Binding.h:29
RooPolynomial
RooPolynomial implements a polynomial p.d.f of the form.
Definition: RooPolynomial.h:28
RooAbsData::plotOn
virtual RooPlot * plotOn(RooPlot *frame, const RooCmdArg &arg1=RooCmdArg::none(), const RooCmdArg &arg2=RooCmdArg::none(), const RooCmdArg &arg3=RooCmdArg::none(), const RooCmdArg &arg4=RooCmdArg::none(), const RooCmdArg &arg5=RooCmdArg::none(), const RooCmdArg &arg6=RooCmdArg::none(), const RooCmdArg &arg7=RooCmdArg::none(), const RooCmdArg &arg8=RooCmdArg::none()) const
Definition: RooAbsData.cxx:547
RooPlot.h
RooPlot::GetYaxis
TAxis * GetYaxis() const
Definition: RooPlot.cxx:1258
RooPlot
A RooPlot is a plot frame and a container for graphics objects within that frame.
Definition: RooPlot.h:44
RooRealVar.h
kRed
@ kRed
Definition: Rtypes.h:66
RooFitResult.h
RooConstVar.h
RooFit::LineColor
RooCmdArg LineColor(Color_t color)
Definition: RooGlobalFunc.cxx:57
TCanvas
The Canvas class.
Definition: TCanvas.h:23
TAxis.h
RooFit::Range
RooCmdArg Range(const char *rangeName, Bool_t adjustNorm=kTRUE)
Definition: RooGlobalFunc.cxx:53
RooFitResult::Print
virtual void Print(Option_t *options=0) const
Print TNamed name and title.
Definition: RooFitResult.h:66
kDashed
@ kDashed
Definition: TAttLine.h:48
gPad
#define gPad
Definition: TVirtualPad.h:287
RooDataSet
RooDataSet is a container class to hold unbinned data.
Definition: RooDataSet.h:33
make_cnn_model.model
model
Definition: make_cnn_model.py:6
RooFit::LineStyle
RooCmdArg LineStyle(Style_t style)
Definition: RooGlobalFunc.cxx:58
TAttAxis::SetTitleOffset
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition: TAttAxis.cxx:293
RooRealVar
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:37
RooFit::Save
RooCmdArg Save(Bool_t flag=kTRUE)
Definition: RooGlobalFunc.cxx:190
TH1.h
RooFit::Title
RooCmdArg Title(const char *name)
Definition: RooGlobalFunc.cxx:176
RooFit::RooConst
RooConstVar & RooConst(Double_t val)
Definition: RooGlobalFunc.cxx:347