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5. plot data and PDF. 3. generate 10^4 toy events. 2. create PDF model with these variables. 4. fit PDF and all floating parameters to data 4/// Basic functionality: The class factory for functions and pdfs 32using namespace RooFit; 73 // Create instance of MyPdfV3 class. RooFit provides functionality for building the pdf's Rule #2 – Create a function or pdf object Customized p.d.f from interpreted expressions. RooFit provides functionality for building the pdf's Offer option of providing analytical integrals, custom handling of toy MC.In RooFit every variable, data point, function, PDF RooGaussian gauss("gauss","gaussian PDF",x,mean,sigma) ;. // Plot PDF Create dataset variables. All individual components of the RooFit PDF (the variables, component PDFs, and the combined PDF) are all created individually by calling the constructors Data Visualization in RooFit - Overview. RooAbsPdf(x,y,z) Takes care of normalization PDF projection curves Enter custom definition of observables.