root/Minuit2/InitialGradientCalculator.h

0001 // @(#)root/minuit2:$Id$
0002 // Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
0003
0004 /**********************************************************************
0005  *                                                                    *
0006  * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
0007  *                                                                    *
0008  **********************************************************************/
0009
0010 #ifndef ROOT_Minuit2_InitialGradientCalculator
0011 #define ROOT_Minuit2_InitialGradientCalculator
0012
0013 #include "Minuit2/GradientCalculator.h"
0014
0015 namespace ROOT {
0016
0017 namespace Minuit2 {
0018
0019 class MnFcn;
0020 class MnUserTransformation;
0021 class MnMachinePrecision;
0022 class MnStrategy;
0023
0024 /**
0025    Class to calculate an initial estimate of the gradient
0026  */
0027 class InitialGradientCalculator : public GradientCalculator {
0028
0029 public:
0030    InitialGradientCalculator(const MnFcn &fcn, const MnUserTransformation &par, const MnStrategy &stra)
0031       : fFcn(fcn), fTransformation(par), fStrategy(stra){};
0032
0033    ~InitialGradientCalculator() override {}
0034
0035    FunctionGradient operator()(const MinimumParameters &) const override;
0036
0037    FunctionGradient operator()(const MinimumParameters &, const FunctionGradient &) const override;
0038
0039    const MnFcn &Fcn() const { return fFcn; }
0040    const MnUserTransformation &Trafo() const { return fTransformation; }
0041    const MnMachinePrecision &Precision() const;
0042    const MnStrategy &Strategy() const { return fStrategy; }
0043
0044    unsigned int Ncycle() const;
0045    double StepTolerance() const;
0046    double GradTolerance() const;
0047
0048 private:
0049    const MnFcn &fFcn;
0050    const MnUserTransformation &fTransformation;
0051    const MnStrategy &fStrategy;
0052 };
0053
0054 } // namespace Minuit2
0055
0056 } // namespace ROOT
0057
0058 #endif // ROOT_Minuit2_InitialGradientCalculator