/// \file /// \ingroup tutorial_roofit /// \notebook -nodraw /// /// Organisation and simultaneous fits: creating and writing a workspace /// /// \macro_output /// \macro_code /// /// \date 07/2008 /// \author Wouter Verkerke #include "RooRealVar.h" #include "RooDataSet.h" #include "RooGaussian.h" #include "RooConstVar.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 rf502_wspacewrite() { // C r e a t e m o d e l a n d d a t a s e t // ----------------------------------------------- // Declare observable x RooRealVar x("x", "x", 0, 10); // Create two Gaussian PDFs g1(x,mean1,sigma) anf g2(x,mean2,sigma) and their parameters RooRealVar mean("mean", "mean of gaussians", 5, 0, 10); RooRealVar sigma1("sigma1", "width of gaussians", 0.5); RooRealVar sigma2("sigma2", "width of gaussians", 1); RooGaussian sig1("sig1", "Signal component 1", x, mean, sigma1); RooGaussian sig2("sig2", "Signal component 2", x, mean, sigma2); // Build Chebychev polynomial p.d.f. RooRealVar a0("a0", "a0", 0.5, 0., 1.); RooRealVar a1("a1", "a1", 0.2, 0, 1.); RooChebychev bkg("bkg", "Background", x, RooArgSet(a0, a1)); // Sum the signal components into a composite signal p.d.f. RooRealVar sig1frac("sig1frac", "fraction of component 1 in signal", 0.8, 0., 1.); RooAddPdf sig("sig", "Signal", RooArgList(sig1, sig2), sig1frac); // Sum the composite signal and background RooRealVar bkgfrac("bkgfrac", "fraction of background", 0.5, 0., 1.); RooAddPdf model("model", "g1+g2+a", RooArgList(bkg, sig), bkgfrac); // Generate a data sample of 1000 events in x from model RooDataSet *data = model.generate(x, 1000); // C r e a t e w o r k s p a c e , i m p o r t d a t a a n d m o d e l // ----------------------------------------------------------------------------- // Create a new empty workspace RooWorkspace *w = new RooWorkspace("w", "workspace"); // Import model and all its components into the workspace w->import(model); // Import data into the workspace w->import(*data); // Print workspace contents w->Print(); // S a v e w o r k s p a c e i n f i l e // ------------------------------------------- // Save the workspace into a ROOT file w->writeToFile("rf502_workspace.root"); // Workspace will remain in memory after macro finishes gDirectory->Add(w); }