RooRealVar x("x", "x", 0, 10);
RooRealVar y("y", "y", -1, 1); y.setVal(0.5);
RooRealVar z("z", "z", -5, 5); z.setVal(3); z.setStepSize(0.1);These examples showcase some of the functionality of RooRealVar. The package library for RooRealVar is ROOT, as it is part of the ROOT framework for data analysis.