Logo ROOT   6.10/00
Reference Guide
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Groups Pages
rf106_plotdecoration.C File Reference
RooFit Tutorials

Detailed Description

'BASIC FUNCTIONALITY' RooFit tutorial macro #106

Adding boxes with parameters, statistics to RooPlots. Decorating RooPlots with arrows, text etc...

pict1_rf106_plotdecoration.C.png
Processing /builddir/build/BUILD/root-6.10.00/tutorials/roofit/rf106_plotdecoration.C...
RooFit v3.60 -- Developed by Wouter Verkerke and David Kirkby
Copyright (C) 2000-2013 NIKHEF, University of California & Stanford University
All rights reserved, please read http://roofit.sourceforge.net/license.txt
[#1] INFO:Minization -- RooMinimizer::optimizeConst: activating const optimization
**********
** 1 **SET PRINT 1
**********
**********
** 2 **SET NOGRAD
**********
PARAMETER DEFINITIONS:
NO. NAME VALUE STEP SIZE LIMITS
1 mean -3.00000e+00 2.00000e+00 -1.00000e+01 1.00000e+01
2 sigma 1.00000e+00 4.50000e-01 1.00000e-01 1.00000e+01
**********
** 3 **SET ERR 0.5
**********
**********
** 4 **SET PRINT 1
**********
**********
** 5 **SET STR 1
**********
NOW USING STRATEGY 1: TRY TO BALANCE SPEED AGAINST RELIABILITY
**********
** 6 **MIGRAD 1000 1
**********
FIRST CALL TO USER FUNCTION AT NEW START POINT, WITH IFLAG=4.
START MIGRAD MINIMIZATION. STRATEGY 1. CONVERGENCE WHEN EDM .LT. 1.00e-03
FCN=1457.87 FROM MIGRAD STATUS=INITIATE 8 CALLS 9 TOTAL
EDM= unknown STRATEGY= 1 NO ERROR MATRIX
EXT PARAMETER CURRENT GUESS STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 mean -3.00000e+00 2.00000e+00 2.11716e-01 -2.55667e+02
2 sigma 1.00000e+00 4.50000e-01 1.63378e-01 -2.21584e+02
ERR DEF= 0.5
MIGRAD MINIMIZATION HAS CONVERGED.
MIGRAD WILL VERIFY CONVERGENCE AND ERROR MATRIX.
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=1456.09 FROM MIGRAD STATUS=CONVERGED 31 CALLS 32 TOTAL
EDM=1.47238e-07 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER STEP FIRST
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 mean -2.97319e+00 3.28196e-02 9.04112e-05 1.05544e-01
2 sigma 1.03785e+00 2.32067e-02 2.10225e-04 -1.56386e-02
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 2 ERR DEF=0.5
1.077e-03 4.600e-07
4.600e-07 5.386e-04
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2
1 0.00060 1.000 0.001
2 0.00060 0.001 1.000
**********
** 7 **SET ERR 0.5
**********
**********
** 8 **SET PRINT 1
**********
**********
** 9 **HESSE 1000
**********
COVARIANCE MATRIX CALCULATED SUCCESSFULLY
FCN=1456.09 FROM HESSE STATUS=OK 10 CALLS 42 TOTAL
EDM=1.47267e-07 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER INTERNAL INTERNAL
NO. NAME VALUE ERROR STEP SIZE VALUE
1 mean -2.97319e+00 3.28196e-02 1.80822e-05 -3.01883e-01
2 sigma 1.03785e+00 2.32067e-02 8.40899e-06 -9.45066e-01
ERR DEF= 0.5
EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 2 ERR DEF=0.5
1.077e-03 1.019e-07
1.019e-07 5.386e-04
PARAMETER CORRELATION COEFFICIENTS
NO. GLOBAL 1 2
1 0.00013 1.000 0.000
2 0.00013 0.000 1.000
[#1] INFO:Minization -- RooMinimizer::optimizeConst: deactivating const optimization
#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
#include "TText.h"
#include "TArrow.h"
#include "TFile.h"
using namespace RooFit ;
void rf106_plotdecoration()
{
// S e t u p m o d e l
// ---------------------
// Create observables
RooRealVar x("x","x",-10,10) ;
// Create Gaussian
RooRealVar sigma("sigma","sigma",1,0.1,10) ;
RooRealVar mean("mean","mean",-3,-10,10) ;
RooGaussian gauss("gauss","gauss",x,mean,sigma) ;
// Generate a sample of 1000 events with sigma=3
RooDataSet* data = gauss.generate(x,1000) ;
// Fit pdf to data
gauss.fitTo(*data) ;
// P l o t p . d . f a n d d a t a
// -------------------------------------
// Overlay projection of gauss on data
RooPlot* frame = x.frame(Name("xframe"),Title("RooPlot with decorations"),Bins(40)) ;
data->plotOn(frame) ;
gauss.plotOn(frame) ;
// A d d b o x w i t h p d f p a r a m e t e r s
// -----------------------------------------------------
// Left edge of box starts at 55% of Xaxis)
gauss.paramOn(frame,Layout(0.55)) ;
// A d d b o x w i t h d a t a s t a t i s t i c s
// -------------------------------------------------------
// X size of box is from 55% to 99% of Xaxis range, top of box is at 80% of Yaxis range)
data->statOn(frame,Layout(0.55,0.99,0.8)) ;
// A d d t e x t a n d a r r o w
// -----------------------------------
// Add text to frame
TText* txt = new TText(2,100,"Signal") ;
txt->SetTextSize(0.04) ;
txt->SetTextColor(kRed) ;
frame->addObject(txt) ;
// Add arrow to frame
TArrow* arrow = new TArrow(2,100,-1,50,0.01,"|>") ;
arrow->SetLineColor(kRed) ;
arrow->SetFillColor(kRed) ;
arrow->SetLineWidth(3) ;
frame->addObject(arrow) ;
// P e r s i s t f r a m e w i t h a l l d e c o r a t i o n s i n R O O T f i l e
// ---------------------------------------------------------------------------------------------
TFile f("rf106_plotdecoration.root","RECREATE") ;
frame->Write() ;
f.Close() ;
// To read back and plot frame with all decorations in clean root session do
// root> TFile f("rf106_plotdecoration.root") ;
// root> xframe->Draw() ;
new TCanvas("rf106_plotdecoration","rf106_plotdecoration",600,600) ;
gPad->SetLeftMargin(0.15) ; frame->GetYaxis()->SetTitleOffset(1.6) ; frame->Draw() ;
}
Author
07/2008 - Wouter Verkerke

Definition in file rf106_plotdecoration.C.