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Reference Guide
rf902_numgenconfig.C File Reference

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Numeric algorithm tuning: configuration and customization of how MC sampling algorithms on specific p.d.f.s are executed

␛[1mRooFit v3.60 -- Developed by Wouter Verkerke and David Kirkby␛[0m
Copyright (C) 2000-2013 NIKHEF, University of California & Stanford University
All rights reserved, please read http://roofit.sourceforge.net/license.txt
[#0] ERROR:InputArguments -- Trying to set invalid state label 'RooAcceptReject' for category method1D
--- RooGenContext ---
Using PDF RooChebychev::model[ x=x coefList=(0,0.5,-0.1) ]
Use PDF generator for ()
Use MC sampling generator RooFoamGenerator for (x)
RooDataSet::modelData[x] = 10000 entries
F **************************************** F
F ****** TFoam::Initialize ****** F
F **************************************** F
F Version = 1.02M = Release date: 2005.04.10 F
F kDim = 1 = Dimension of the hyper-cubical space F
F nCells = 30 = Requested number of Cells (half of them active) F
F nSampl = 200 = No of MC events in exploration of a cell F
F nBin = 8 = No of bins in histograms, MC exploration of cell F
F EvPerBin = 25 = Maximum No effective_events/bin, MC exploration F
F OptDrive = 2 = Type of Driver =1,2 for Sigma,WtMax F
F OptRej = 1 = MC rejection on/off for OptRej=0,1 F
F MaxWtRej = 1.1 = Maximum wt in rejection for wt=1 evts F
F *** TFoam::Initialize FINISHED!!! *** F
F nCalls = 5800 = Total number of function calls F
F XPrime = 0.10992972 = Primary total integral F
F XDiver = 0.010000374 = Driver total integral F
F mcResult = 0.099929343 = Estimate of the true MC Integral F
--- RooGenContext ---
Using PDF RooChebychev::model[ x=x coefList=(0,0.5,-0.1) ]
Use PDF generator for ()
Use MC sampling generator RooFoamGenerator for (x)
RooDataSet::modelData[x] = 10000 entries
#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooConstVar.h"
#include "RooChebychev.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
#include "RooArgSet.h"
#include <iomanip>
using namespace RooFit;
// A d j u s t g l o b a l MC s a m p l i n g s t r a t e g y
// ------------------------------------------------------------------
// Example p.d.f. for use below
RooRealVar x("x", "x", 0, 10);
RooChebychev model("model", "model", x, RooArgList(RooConst(0), RooConst(0.5), RooConst(-0.1)));
// Change global strategy for 1D sampling problems without conditional observable
// (1st kFALSE) and without discrete observable (2nd kFALSE) from RooFoamGenerator,
// ( an interface to the TFoam MC generator with adaptive subdivisioning strategy ) to RooAcceptReject,
// a plain accept/reject sampling algorithm [ RooFit default before ROOT 5.23/04 ]
// Generate 10Kevt using RooAcceptReject
RooDataSet *data_ar = model.generate(x, 10000, Verbose(kTRUE));
// A d j u s t i n g d e f a u l t c o n f i g f o r a s p e c i f i c p d f
// -------------------------------------------------------------------------------------
// Another possibility: associate custom MC sampling configuration as default for object 'model'
// The kTRUE argument will install a clone of the default configuration as specialized configuration
// for this model if none existed so far
model.specialGeneratorConfig(kTRUE)->method1D(kFALSE, kFALSE).setLabel("RooFoamGenerator");
// A d j u s t i n g p a r a m e t e r s o f a s p e c i f i c t e c h n i q u e
// ---------------------------------------------------------------------------------------
// Adjust maximum number of steps of RooIntegrator1D in the global default configuration
RooAbsPdf::defaultGeneratorConfig()->getConfigSection("RooAcceptReject").setRealValue("nTrial1D", 2000);
// Example of how to change the parameters of a numeric integrator
// (Each config section is a RooArgSet with RooRealVars holding real-valued parameters
// and RooCategories holding parameters with a finite set of options)
model.specialGeneratorConfig()->getConfigSection("RooFoamGenerator").setRealValue("chatLevel", 1);
// Generate 10Kevt using RooFoamGenerator (FOAM verbosity increased with above chatLevel adjustment for illustration
// purposes)
RooDataSet *data_foam = model.generate(x, 10000, Verbose());
const Bool_t kFALSE
Definition: RtypesCore.h:90
const Bool_t kTRUE
Definition: RtypesCore.h:89
Bool_t setRealValue(const char *name, Double_t newVal=0, Bool_t verbose=kFALSE)
Set value of a RooAbsRealLValye stored in set with given name to newVal No error messages are printed...
virtual void Print(Option_t *options=0) const
Print TNamed name and title.
Definition: RooAbsData.h:175
static RooNumGenConfig * defaultGeneratorConfig()
Returns the default numeric MC generator configuration for all RooAbsReals.
Definition: RooAbsPdf.cxx:3497
RooArgList is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgList.h:21
virtual Bool_t setLabel(const char *label, bool printError=true) override
Set value by specifying the name of the desired state.
Chebychev polynomial p.d.f.
Definition: RooChebychev.h:25
RooDataSet is a container class to hold unbinned data.
Definition: RooDataSet.h:33
RooCategory & method1D(Bool_t cond, Bool_t cat)
const RooArgSet & getConfigSection(const char *name) const
Retrieve configuration information specific to integrator with given name.
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:35
RooConstVar & RooConst(Double_t val)
RooCmdArg Verbose(Bool_t flag=kTRUE)
Double_t x[n]
Definition: legend1.C:17
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Wouter Verkerke

Definition in file rf902_numgenconfig.C.