rf106_plotdecoration.C File Reference

Detailed Description

'BASIC FUNCTIONALITY' RooFit tutorial macro #106

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

Processing /mnt/vdb/lsf/workspace/root-makedoc-v608/rootspi/rdoc/src/v6-08-00-patches/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.