HessianGradientCalculator.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_HessianGradientCalculator
#define ROOT_Minuit2_HessianGradientCalculator
 
#include "Minuit2/GradientCalculator.h"
#include "Minuit2/MnMatrix.h"
#include <utility>
 
namespace ROOT {
 
   namespace Minuit2 {
 
 
 
class MnFcn;
class MnUserTransformation;
class MnMachinePrecision;
class MnStrategy;
 
/**
   HessianGradientCalculator: class to calculate Gradient for Hessian
 */
 
class HessianGradientCalculator : public GradientCalculator {
 
public:
 
  HessianGradientCalculator(const MnFcn& fcn, const MnUserTransformation& par,
                            const MnStrategy& stra) :
    fFcn(fcn), fTransformation(par), fStrategy(stra) {}
 
  virtual ~HessianGradientCalculator() {}
 
  virtual FunctionGradient operator()(const MinimumParameters&) const;
 
  virtual FunctionGradient operator()(const MinimumParameters&,
                                      const FunctionGradient&) const;
 
  std::pair<FunctionGradient, MnAlgebraicVector> DeltaGradient(const MinimumParameters&, const FunctionGradient&) const;
 
  const MnFcn& Fcn() const {return fFcn;}
  const MnUserTransformation& Trafo() const {return fTransformation;}
  const MnMachinePrecision& Precision() const;
  const MnStrategy& Strategy() const {return fStrategy;}
 
  unsigned int Ncycle() const;
  double StepTolerance() const;
  double GradTolerance() const;
 
private:
 
  const MnFcn& fFcn;
  const MnUserTransformation& fTransformation;
  const MnStrategy& fStrategy;
};
 
  }  // namespace Minuit2
 
}  // namespace ROOT
 
#endif  // ROOT_Minuit2_HessianGradientCalculator