AnalyticalGradientCalculator.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_AnalyticalGradientCalculator
#define ROOT_Minuit2_AnalyticalGradientCalculator
 
#include "Minuit2/GradientCalculator.h"
#include "Minuit2/MnMatrixfwd.h"
 
namespace ROOT {
 
namespace Minuit2 {
 
class FCNBase;
class MnUserTransformation;
 
 
class AnalyticalGradientCalculator : public GradientCalculator {
 
public:
   AnalyticalGradientCalculator(const FCNBase &fcn, const MnUserTransformation &state)
      : fGradFunc(fcn), fTransformation(state)
   {
   }
 
   ~AnalyticalGradientCalculator() override {}
 
   FunctionGradient operator()(const MinimumParameters &) const override;
 
   FunctionGradient operator()(const MinimumParameters &, const FunctionGradient &) const override;
 
   /// compute Hessian matrix
   bool Hessian(const MinimumParameters &, MnAlgebraicSymMatrix &) const override;
 
   /// compute second derivatives (diagonal of Hessian)
   bool G2(const MinimumParameters &, MnAlgebraicVector &) const override;
 
   virtual bool CanComputeG2() const;
 
   virtual bool CanComputeHessian() const;
 
protected:
   const FCNBase &fGradFunc;
   const MnUserTransformation &fTransformation;
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_AnalyticalGradientCalculator