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RooSecondMoment.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * File: $Id$
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 *
10  * and Stanford University. All rights reserved. *
11  * *
12  * Redistribution and use in source and binary forms, *
13  * with or without modification, are permitted according to the terms *
14  * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
15  *****************************************************************************/
16 #ifndef ROO_SECOND_MOMENT
17 #define ROO_SECOND_MOMENT
18 
19 #include "RooAbsMoment.h"
20 #include "RooRealProxy.h"
21 #include "RooSetProxy.h"
22 
23 
24 class RooRealVar;
25 class RooArgList ;
26 
27 class RooSecondMoment : public RooAbsMoment {
28 public:
29 
30  RooSecondMoment() ;
31  RooSecondMoment(const char *name, const char *title, RooAbsReal& func, RooRealVar& x, Bool_t central=kFALSE, Bool_t takeRoot=kFALSE) ;
32  RooSecondMoment(const char *name, const char *title, RooAbsReal& func, RooRealVar& x, const RooArgSet& nset, Bool_t central=kFALSE, Bool_t takeRoot=kFALSE, Bool_t intNSet=kFALSE) ;
33  virtual ~RooSecondMoment() ;
34 
35  RooSecondMoment(const RooSecondMoment& other, const char* name = 0);
36  virtual TObject* clone(const char* newname) const { return new RooSecondMoment(*this, newname); }
37 
38  const RooAbsReal& xF() { return _xf.arg() ; }
39  const RooAbsReal& ixF() { return _ixf.arg() ; }
40  const RooAbsReal& iF() { return _if.arg() ; }
41 
42 protected:
43 
44  RooRealProxy _xf ; // (X-offset)*F
45  RooRealProxy _ixf ; // Int((X-offset)*F(X))dx ;
46  RooRealProxy _if ; // Int(F(x))dx ;
47  Double_t _xfOffset ; // offset
48  Double_t evaluate() const;
49 
50  ClassDef(RooSecondMoment,1) // Representation of moment in a RooAbsReal in a given RooRealVar
51 };
52 
53 #endif
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:28
RooRealProxy _xf
RooRealProxy _if
RooAbsMoment represents the first, second, or third order derivative of any RooAbsReal as calculated ...
Definition: RooAbsMoment.h:27
Double_t x[n]
Definition: legend1.C:17
#define ClassDef(name, id)
Definition: Rtypes.h:322
virtual ~RooSecondMoment()
Destructor.
const RooAbsReal & iF()
Bool_t central() const
Definition: RooAbsMoment.h:36
RooRealProxy _ixf
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:35
virtual TObject * clone(const char *newname) const
const T & arg() const
Return reference to object held in proxy.
const RooAbsReal & ixF()
Double_t evaluate() const
Calculate value.
const Bool_t kFALSE
Definition: RtypesCore.h:90
RooSecondMoment represents the first, second, or third order derivative of any RooAbsReal as calculat...
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:60
Mother of all ROOT objects.
Definition: TObject.h:37
RooSecondMoment()
Default constructor.
RooArgList is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgList.h:21
char name[80]
Definition: TGX11.cxx:109
const RooAbsReal & xF()