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rf405_realtocatfuncs.C File Reference

Detailed Description

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Data and categories: demonstration of real-->discrete mapping functions

#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "RooCategory.h"
#include "Roo1DTable.h"
#include "RooArgusBG.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit;
// D e f i n e p d f i n x , s a m p l e d a t a s e t i n x
// ------------------------------------------------------------------------
// Define a dummy PDF in x
RooRealVar x("x", "x", 0, 10);
RooArgusBG a("a", "argus(x)", x, 10.0, -1.0);
// Generate a dummy dataset
std::unique_ptr<RooDataSet> data{a.generate(x, 10000)};
// C r e a t e a t h r e s h o l d r e a l - > c a t f u n c t i o n
// --------------------------------------------------------------------------
// A RooThresholdCategory is a category function that maps regions in a real-valued
// input observable observables to state names. At construction time a 'default'
// state name must be specified to which all values of x are mapped that are not
// otherwise assigned
RooThresholdCategory xRegion("xRegion", "region of x", x, "Background");
// Specify thresholds and state assignments one-by-one.
// Each statement specifies that all values _below_ the given value
// (and above any lower specified threshold) are mapped to the
// category state with the given name
// Background | SideBand | Signal | SideBand | Background
// 4.23 5.23 8.23 9.23
xRegion.addThreshold(4.23, "Background");
xRegion.addThreshold(5.23, "SideBand");
xRegion.addThreshold(8.23, "Signal");
xRegion.addThreshold(9.23, "SideBand");
// U s e t h r e s h o l d f u n c t i o n t o p l o t d a t a r e g i o n s
// -------------------------------------------------------------------------------------
// Add values of threshold function to dataset so that it can be used as observable
// Make plot of data in x
RooPlot *xframe = x.frame(Title("Demo of threshold and binning mapping functions"));
// Use calculated category to select sideband data
data->plotOn(xframe, Cut("xRegion==xRegion::SideBand"), MarkerColor(kRed), LineColor(kRed));
// C r e a t e a b i n n i n g r e a l - > c a t f u n c t i o n
// ----------------------------------------------------------------------
// A RooBinningCategory is a category function that maps bins of a (named) binning definition
// in a real-valued input observable observables to state names. The state names are automatically
// constructed from the variable name, the binning name and the bin number. If no binning name
// is specified the default binning is mapped
x.setBins(10, "coarse");
RooBinningCategory xBins("xBins", "coarse bins in x", x, "coarse");
// U s e b i n n i n g f u n c t i o n f o r t a b u l a t i o n a n d p l o t t i n g
// -----------------------------------------------------------------------------------------------
// Print table of xBins state multiplicity. Note that xBins does not need to be an observable in data
// it can be a function of observables in data as well
Roo1DTable *xbtable = data->table(xBins);
// Add values of xBins function to dataset so that it can be used as observable
RooCategory *xb = (RooCategory *)data->addColumn(xBins);
// Define range "alt" as including bins 1,3,5,7,9
xb->setRange("alt", "x_coarse_bin1,x_coarse_bin3,x_coarse_bin5,x_coarse_bin7,x_coarse_bin9");
// Construct subset of data matching range "alt" but only for the first 5000 events and plot it on the frame
std::unique_ptr<RooAbsData> dataSel{data->reduce(CutRange("alt"), EventRange(0, 5000))};
dataSel->plotOn(xframe, MarkerColor(kGreen), LineColor(kGreen));
new TCanvas("rf405_realtocatfuncs", "rf405_realtocatfuncs", 600, 600);
#define a(i)
Definition RSha256.hxx:99
@ kRed
Definition Rtypes.h:66
@ kGreen
Definition Rtypes.h:66
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void data
#define gPad
One-dimensional table.
Definition Roo1DTable.h:23
void Print(Option_t *options=nullptr) const override
This method must be overridden when a class wants to print itself.
Definition Roo1DTable.h:50
RooArgusBG is a RooAbsPdf implementation describing the ARGUS background shape.
Definition RooArgusBG.h:22
Provides a real-to-category mapping defined by a series of thresholds.
Object to represent discrete states.
Definition RooCategory.h:28
void setRange(const char *rangeName, const char *stateNameList)
Plot frame and a container for graphics objects within that frame.
Definition RooPlot.h:43
static RooPlot * frame(const RooAbsRealLValue &var, double xmin, double xmax, Int_t nBins)
Create a new frame for a given variable in x.
Definition RooPlot.cxx:237
virtual void SetMinimum(double minimum=-1111)
Set minimum value of Y axis.
Definition RooPlot.cxx:1059
TAxis * GetYaxis() const
Definition RooPlot.cxx:1276
void Draw(Option_t *options=nullptr) override
Draw this plot and all of the elements it contains.
Definition RooPlot.cxx:649
Variable that can be changed from the outside.
Definition RooRealVar.h:37
A real-to-category mapping defined by a series of thresholds.
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition TAttAxis.cxx:298
The Canvas class.
Definition TCanvas.h:23
RooCmdArg MarkerColor(Color_t color)
RooCmdArg LineColor(Color_t color)
Double_t x[n]
Definition legend1.C:17
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition JSONIO.h:26
[#1] INFO:Plotting -- RooTreeData::plotOn: plotting 2748 events out of 10000 total events
Table xBins : aData
| x_coarse_bin0 | 105 |
| x_coarse_bin1 | 329 |
| x_coarse_bin2 | 499 |
| x_coarse_bin3 | 739 |
| x_coarse_bin4 | 934 |
| x_coarse_bin5 | 1218 |
| x_coarse_bin6 | 1450 |
| x_coarse_bin7 | 1675 |
| x_coarse_bin8 | 1767 |
| x_coarse_bin9 | 1284 |
[#1] INFO:Plotting -- RooPlot::updateFitRangeNorm: New event count of 2627 will supersede previous event count of 10000 for normalization of PDF projections
July 2008
Wouter Verkerke

Definition in file rf405_realtocatfuncs.C.