ROOT   Reference Guide
RooPullVar.cxx
Go to the documentation of this file.
1/*****************************************************************************
2 * Project: RooFit *
3 * Package: RooFitCore *
4 * @(#)root/roofitcore:$Id$
5 * Authors: *
6 * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7 * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8 * *
9 * Copyright (c) 2000-2005, Regents of the University of California *
11 * *
12 * Redistribution and use in source and binary forms, *
13 * with or without modification, are permitted according to the terms *
15 *****************************************************************************/
16
17/**
18\file RooPullVar.cxx
19\class RooPullVar
20\ingroup Roofitcore
21
22RooPullVar represents the pull of a measurement w.r.t. the true value
23using the measurement and its error. Both the true value and
24the measured value (with error) are taken from two user-supplied
25RooRealVars. If the measured parameter has an asymmetric error, the proper
26side of that error will be used:
27\f[
28 \mathrm{Pull}_x = \frac{x_\mathrm{meas}-x_\mathrm{true}}{\Delta_x}
29\f]
30**/
31
32#include "RooPullVar.h"
33
34#include "RooFit.h"
35#include "RooAbsReal.h"
36#include "RooRealVar.h"
37
38using namespace std;
39
41;
42
43
44////////////////////////////////////////////////////////////////////////////////
45/// Default constructor
46
48{
49}
50
51
52
53////////////////////////////////////////////////////////////////////////////////
54/// Construct the pull of the RooRealVar 'meas'.
55///
56/// \param[in] name Name of the pull variable.
57/// \param[in] title The title (for plotting).
58/// \param[in] meas The measurement. This variable needs to have an error, and therefore is a RooRealVar.
59/// \param[in] truth The true value.
60RooPullVar::RooPullVar(const char* name, const char* title, RooRealVar& meas, RooAbsReal& truth) :
61 RooAbsReal(name, title),
62 _meas("meas","Measurement",this,meas),
63 _true("true","Truth",this,truth)
64{
65}
66
67
68
69
70
71////////////////////////////////////////////////////////////////////////////////
72/// Copy constructor
73
74RooPullVar::RooPullVar(const RooPullVar& other, const char* name) :
75 RooAbsReal(other, name),
76 _meas("meas",this,other._meas),
77 _true("true",this,other._true)
78{
79}
80
81
82
83////////////////////////////////////////////////////////////////////////////////
84/// Destructor
85
87{
88}
89
90
91
92////////////////////////////////////////////////////////////////////////////////
93/// Calculate pull. Use asymmetric error if defined in measurement,
94/// otherwise use symmetric error. If measurement has no error
95/// return zero.
96
98{
99 const auto& meas = _meas.arg();
100 if (meas.hasAsymError()) {
101 Double_t delta = _meas-_true ;
102 if (delta<0) {
103 return delta/meas.getAsymErrorHi() ;
104 } else {
105 return -delta/meas.getAsymErrorLo() ;
106 }
107 } else if (meas.hasError()) {
108 return (_meas-_true)/meas.getError() ;
109 } else {
110 return 0 ;
111 }
112}
113
114
#define ClassImp(name)
Definition: Rtypes.h:361
char name[80]
Definition: TGX11.cxx:109
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:60
RooPullVar represents the pull of a measurement w.r.t.
Definition: RooPullVar.h:24
Double_t evaluate() const
Calculate pull.
Definition: RooPullVar.cxx:97
virtual ~RooPullVar()
Destructor.
Definition: RooPullVar.cxx:86
RooPullVar()
Default constructor.
Definition: RooPullVar.cxx:47
RooTemplateProxy< RooRealVar > _meas
Definition: RooPullVar.h:37
RooRealProxy _true
Definition: RooPullVar.h:38
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:35
const T & arg() const
Return reference to object held in proxy.