MnMigrad.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/
 
#ifndef ROOT_Minuit2_MnMigrad
#define ROOT_Minuit2_MnMigrad
 
#include "Minuit2/MnApplication.h"
#include "Minuit2/VariableMetricMinimizer.h"
 
#include <vector>
 
namespace ROOT {
 
namespace Minuit2 {
 
class FCNBase;
 
//_____________________________________________________________________________
/**
   API class for minimization using Variable Metric technology ("MIGRAD");
    allows for user interaction: set/change parameters, do minimization,
    change parameters, re-do minimization etc.;
    also used by MnMinos and MnContours;
 */
 
class MnMigrad : public MnApplication {
 
public:
   /// construct from FCNBase + MnUserParameterState + MnStrategy
   MnMigrad(const FCNBase &fcn, const MnUserParameterState &par, const MnStrategy &str = MnStrategy{1})
      : MnApplication(fcn, {par}, str), fMinimizer(VariableMetricMinimizer())
   {
   }
 
   /// Copy constructor, copy shares the reference to the same FCNBase in MnApplication
   MnMigrad(const MnMigrad &) = default;
 
   // Copy assignment deleted, since MnApplication has unassignable reference to FCNBase
   MnMigrad &operator=(const MnMigrad &) = delete;
 
   ModularFunctionMinimizer &Minimizer() override { return fMinimizer; }
   const ModularFunctionMinimizer &Minimizer() const override { return fMinimizer; }
 
private:
   VariableMetricMinimizer fMinimizer;
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_MnMigrad