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Reference Guide
RootFinder.h
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1 // @(#)root/tmva $Id$
2 // Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss
3 
4 /**********************************************************************************
5  * Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
6  * Package: TMVA *
7  * Class : RootFinder *
8  * Web : http://tmva.sourceforge.net *
9  * *
10  * Description: *
11  * Root finding using Brents algorithm *
12  * (translated from CERNLIB function RZERO) *
13  * *
14  * Authors (alphabetical): *
15  * Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland *
16  * Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany *
17  * Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada *
18  * *
19  * Copyright (c) 2005: *
20  * CERN, Switzerland *
21  * U. of Victoria, Canada *
22  * MPI-K Heidelberg, Germany *
23  * *
24  * Redistribution and use in source and binary forms, with or without *
25  * modification, are permitted according to the terms listed in LICENSE *
26  * (http://tmva.sourceforge.net/LICENSE) *
27  **********************************************************************************/
28 
29 #ifndef ROOT_TMVA_RootFinder
30 #define ROOT_TMVA_RootFinder
31 
32 //////////////////////////////////////////////////////////////////////////
33 // //
34 // RootFinder //
35 // //
36 // Root finding using Brents algorithm //
37 // (translated from CERNLIB function RZERO) //
38 // //
39 //////////////////////////////////////////////////////////////////////////
40 
41 #ifndef ROOT_TObject
42 #include "TObject.h"
43 #endif
44 
45 namespace TMVA {
46 
47  class MsgLogger;
48  class MethodBase;
49 
50  class RootFinder : public TObject {
51 
52  public:
53 
54  RootFinder( MethodBase *method,
55  Double_t rootMin, Double_t rootMax,
56  Int_t maxIterations = 100,
57  Double_t absTolerance = 0.0 );
58  virtual ~RootFinder( void );
59 
60  // returns the root of the function
61  Double_t Root( Double_t refValue );
62 
63  private:
64 
65  Double_t fRootMin; // minimum root value
66  Double_t fRootMax; // maximum root value
67  Int_t fMaxIter; // maximum number of iterations
68  Double_t fAbsTol; // absolute tolerance deviation
69 
70  // Methods pointer
72 
73  mutable MsgLogger* fLogger; //! message logger
74  MsgLogger& Log() const { return *fLogger; }
75 
76  ClassDef(RootFinder,0); // Root finding using Brents algorithm
77  };
78 
79 } // namespace TMVA
80 
81 #endif
int Int_t
Definition: RtypesCore.h:41
Double_t fAbsTol
Definition: RootFinder.h:68
MethodBase * fMethod
Definition: RootFinder.h:71
Double_t fRootMax
Definition: RootFinder.h:66
#define ClassDef(name, id)
Definition: Rtypes.h:254
MsgLogger * fLogger
Definition: RootFinder.h:73
Double_t Root(Double_t refValue)
Root finding using Brents algorithm; taken from CERNLIB function RZERO.
Definition: RootFinder.cxx:68
Double_t fRootMin
Definition: RootFinder.h:65
MsgLogger & Log() const
message logger
Definition: RootFinder.h:74
RootFinder(MethodBase *method, Double_t rootMin, Double_t rootMax, Int_t maxIterations=100, Double_t absTolerance=0.0)
constructor
Definition: RootFinder.cxx:43
double Double_t
Definition: RtypesCore.h:55
virtual ~RootFinder(void)
destructor
Definition: RootFinder.cxx:60
Mother of all ROOT objects.
Definition: TObject.h:37
Abstract ClassifierFactory template that handles arbitrary types.