Logo ROOT   6.08/07
Reference Guide
TestNonCentral.C
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1 /// \file
2 /// \ingroup tutorial_roostats
3 /// \notebook -js
4 ///
5 /// \macro_image
6 /// \macro_output
7 /// \macro_code
8 ///
9 /// \author Lorenzo Moneta
10 
11 using namespace RooFit;
12 void TestNonCentral(){
13 
14  RooWorkspace w("w");
15  // k <2, must use sum
16  w.factory("NonCentralChiSquare::nc(x[0,50],k[1.99,0,5],lambda[5])");
17  // kk > 2 can use bessel
18  w.factory("NonCentralChiSquare::ncc(x,kk[2.01,0,5],lambda)");
19  // kk > 2, force sum
20  w.factory("NonCentralChiSquare::nccc(x,kk,lambda)");
21  ((RooNonCentralChiSquare*)w.pdf("nccc"))->SetForceSum(true);
22 
23  // a normal "central" chi-square for comparison when lambda->0
24  w.factory("ChiSquarePdf::cs(x,k)");
25 
26  //w.var("kk")->setVal(4.); // test a large kk
27 
28  RooDataSet* ncdata = w.pdf("nc")->generate(*w.var("x"),100);
29  RooDataSet* csdata = w.pdf("cs")->generate(*w.var("x"),100);
30  RooPlot* plot = w.var("x")->frame();
31  ncdata->plotOn(plot,MarkerColor(kRed));
32  csdata->plotOn(plot,MarkerColor(kBlue));
33  w.pdf("nc")->plotOn(plot,LineColor(kRed));
34  w.pdf("ncc")->plotOn(plot,LineColor(kGreen));
35  w.pdf("nccc")->plotOn(plot,LineColor(kYellow),LineStyle(kDashed));
36  w.pdf("cs")->plotOn(plot,LineColor(kBlue),LineStyle(kDotted));
37  plot->Draw();
38 
39 }
virtual RooPlot * plotOn(RooPlot *frame, const RooCmdArg &arg1=RooCmdArg::none(), const RooCmdArg &arg2=RooCmdArg::none(), const RooCmdArg &arg3=RooCmdArg::none(), const RooCmdArg &arg4=RooCmdArg::none(), const RooCmdArg &arg5=RooCmdArg::none(), const RooCmdArg &arg6=RooCmdArg::none(), const RooCmdArg &arg7=RooCmdArg::none(), const RooCmdArg &arg8=RooCmdArg::none()) const
Plot dataset on specified frame.
Definition: RooAbsData.cxx:552
RooCmdArg LineColor(Color_t color)
Definition: Rtypes.h:61
Definition: Rtypes.h:61
Definition: Rtypes.h:61
The PDF of the Non-Central Chi Square distribution for n degrees of freedom.
RooCmdArg LineStyle(Style_t style)
RooDataSet is a container class to hold unbinned data.
Definition: RooDataSet.h:29
A RooPlot is a plot frame and a container for graphics objects within that frame. ...
Definition: RooPlot.h:41
Definition: Rtypes.h:61
RooCmdArg MarkerColor(Color_t color)
The RooWorkspace is a persistable container for RooFit projects.
Definition: RooWorkspace.h:42
virtual void Draw(Option_t *options=0)
Draw this plot and all of the elements it contains.
Definition: RooPlot.cxx:559