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File indexing completed on 2025-01-30 10:22:58
0001 // @(#)root/tmva $Id$ 0002 // Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss 0003 0004 /********************************************************************************** 0005 * Project: TMVA - a Root-integrated toolkit for multivariate data analysis * 0006 * Package: TMVA * 0007 * Class : RootFinder * 0008 * * 0009 * * 0010 * Description: * 0011 * Root finding using Brents algorithm * 0012 * (translated from CERNLIB function RZERO) * 0013 * * 0014 * Authors (alphabetical): * 0015 * Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland * 0016 * Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany * 0017 * Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada * 0018 * * 0019 * Copyright (c) 2005: * 0020 * CERN, Switzerland * 0021 * U. of Victoria, Canada * 0022 * MPI-K Heidelberg, Germany * 0023 * * 0024 * Redistribution and use in source and binary forms, with or without * 0025 * modification, are permitted according to the terms listed in LICENSE * 0026 * (see tmva/doc/LICENSE) * 0027 **********************************************************************************/ 0028 0029 #ifndef ROOT_TMVA_RootFinder 0030 #define ROOT_TMVA_RootFinder 0031 0032 ////////////////////////////////////////////////////////////////////////// 0033 // // 0034 // RootFinder // 0035 // // 0036 // Root finding using Brents algorithm // 0037 // (translated from CERNLIB function RZERO) // 0038 // // 0039 ////////////////////////////////////////////////////////////////////////// 0040 0041 #include "TObject.h" 0042 0043 namespace TMVA { 0044 0045 class MsgLogger; 0046 class MethodBase; 0047 0048 class RootFinder : public TObject { 0049 0050 public: 0051 0052 RootFinder( MethodBase *method, 0053 Double_t rootMin, Double_t rootMax, 0054 Int_t maxIterations = 100, 0055 Double_t absTolerance = 0.0 ); 0056 virtual ~RootFinder( void ); 0057 0058 // returns the root of the function 0059 Double_t Root( Double_t refValue ); 0060 0061 private: 0062 0063 Double_t fRootMin; ///< minimum root value 0064 Double_t fRootMax; ///< maximum root value 0065 Int_t fMaxIter; ///< maximum number of iterations 0066 Double_t fAbsTol; ///< absolute tolerance deviation 0067 0068 // Methods pointer 0069 MethodBase *fMethod; 0070 0071 mutable MsgLogger* fLogger; ///<! message logger 0072 MsgLogger& Log() const { return *fLogger; } 0073 0074 ClassDef(RootFinder,0); // Root finding using Brents algorithm 0075 }; 0076 0077 } // namespace TMVA 0078 0079 #endif
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