root/Minuit2/MnMigrad.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_MnMigrad
0011 #define ROOT_Minuit2_MnMigrad
0012
0013 #include "Minuit2/MnApplication.h"
0014 #include "Minuit2/VariableMetricMinimizer.h"
0015
0016 #include <vector>
0017
0018 namespace ROOT {
0019
0020 namespace Minuit2 {
0021
0022 class FCNBase;
0023
0024 //_____________________________________________________________________________
0025 /**
0026    API class for minimization using Variable Metric technology ("MIGRAD");
0027     allows for user interaction: set/change parameters, do minimization,
0028     change parameters, re-do minimization etc.;
0029     also used by MnMinos and MnContours;
0030  */
0031
0032 class MnMigrad : public MnApplication {
0033
0034 public:
0035    /// construct from FCNBase + MnUserParameterState + MnStrategy
0036    MnMigrad(const FCNBase &fcn, const MnUserParameterState &par, const MnStrategy &str = MnStrategy{1})
0037       : MnApplication(fcn, {par}, str), fMinimizer(VariableMetricMinimizer())
0038    {
0039    }
0040
0041    /// Copy constructor, copy shares the reference to the same FCNBase in MnApplication
0042    MnMigrad(const MnMigrad &) = default;
0043
0044    // Copy assignment deleted, since MnApplication has unassignable reference to FCNBase
0045    MnMigrad &operator=(const MnMigrad &) = delete;
0046
0047    ModularFunctionMinimizer &Minimizer() override { return fMinimizer; }
0048    const ModularFunctionMinimizer &Minimizer() const override { return fMinimizer; }
0049
0050 private:
0051    VariableMetricMinimizer fMinimizer;
0052 };
0053
0054 } // namespace Minuit2
0055
0056 } // namespace ROOT
0057
0058 #endif // ROOT_Minuit2_MnMigrad