rf503_wspaceread.C File Reference

Detailed Description

Organisation and simultaneous fits: reading and using a workspace

The input file for this macro is generated by rf502_wspacewrite.C

 
#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "RooChebychev.h"
#include "RooAddPdf.h"
#include "RooWorkspace.h"
#include "RooPlot.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "TFile.h"
#include "TH1.h"
using namespace RooFit;
 
void rf503_wspaceread()
{
   // R e a d   w o r k s p a c e   f r o m   f i l e
   // -----------------------------------------------
 
   // Open input file with workspace (generated by rf503_wspacewrite)
   TFile *f = new TFile("rf502_workspace.root");
 
   // Retrieve workspace from file
   RooWorkspace *w = (RooWorkspace *)f->Get("w");
 
   // R e t r i e v e   p d f ,   d a t a   f r o m   w o r k s p a c e
   // -----------------------------------------------------------------
 
   // Retrieve x,model and data from workspace
   RooRealVar *x = w->var("x");
   RooAbsPdf *model = w->pdf("model");
   RooAbsData *data = w->data("modelData");
 
   // Print structure of composite pdf
   model->Print("t");
 
   // F i t   m o d e l   t o   d a t a ,   p l o t   m o d e l
   // ---------------------------------------------------------
 
   // Fit model to data
   model->fitTo(*data, PrintLevel(-1));
 
   // Plot data and PDF overlaid
   RooPlot *xframe = x->frame(Title("Model and data read from workspace"));
   data->plotOn(xframe);
   model->plotOn(xframe);
 
   // Overlay the background component of model with a dashed line
   model->plotOn(xframe, Components("bkg"), LineStyle(kDashed));
 
   // Overlay the background+sig2 components of model with a dotted line
   model->plotOn(xframe, Components("bkg,sig2"), LineStyle(kDotted));
 
   // Draw the frame on the canvas
   new TCanvas("rf503_wspaceread", "rf503_wspaceread", 600, 600);
   gPad->SetLeftMargin(0.15);
   xframe->GetYaxis()->SetTitleOffset(1.4);
   xframe->Draw();
}

0x576aaf0 RooAddPdf::model = 0.9/1 [Auto,Clean] 
  0x59b65c0/V- RooChebychev::bkg = 0.8 [Auto,Dirty] 
    0x5263850/V- RooRealVar::x = 5
    0x5087df0/V- RooRealVar::a0 = 0.5
    0x27996e0/V- RooRealVar::a1 = 0.2
  0x5a44f70/V- RooRealVar::bkgfrac = 0.5
  0x5a37b90/V- RooAddPdf::sig = 1/1 [Auto,Clean] 
    0x59cc2b0/V- RooGaussian::sig1 = 1 [Auto,Dirty] 
      0x5263850/V- RooRealVar::x = 5
      0x3ad13b0/V- RooRealVar::mean = 5
      0x50ec200/V- RooRealVar::sigma1 = 0.5
    0x516d120/V- RooRealVar::sig1frac = 0.8
    0x59eaa20/V- RooGaussian::sig2 = 1 [Auto,Dirty] 
      0x5263850/V- RooRealVar::x = 5
      0x3ad13b0/V- RooRealVar::mean = 5
      0x51e7800/V- RooRealVar::sigma2 = 1
[#1] INFO:Fitting -- RooAbsPdf::fitTo(model) fixing normalization set for coefficient determination to observables in data
[#1] INFO:Fitting -- using generic CPU library compiled with no vectorizations
[#1] INFO:Fitting -- Creation of NLL object took 7.44192 ms
[#1] INFO:Fitting -- RooAddition::defaultErrorLevel(nll_model_modelData) Summation contains a RooNLLVar, using its error level
[#1] INFO:Minimization -- [fitFCN] No discrete parameters, performing continuous minimization only
[#1] INFO:Plotting -- RooAbsPdf::plotOn(model) directly selected PDF components: (bkg)
[#1] INFO:Plotting -- RooAbsPdf::plotOn(model) indirectly selected PDF components: ()
[#1] INFO:Plotting -- RooAbsPdf::plotOn(model) directly selected PDF components: (bkg,sig2)
[#1] INFO:Plotting -- RooAbsPdf::plotOn(model) indirectly selected PDF components: (sig)

Date

July 2008

Author

Wouter Verkerke

Definition in file rf503_wspaceread.C.