FumiliGradientCalculator.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_FumiliGradientCalculator
#define ROOT_Minuit2_FumiliGradientCalculator
 
#include "Minuit2/GradientCalculator.h"
#include "Minuit2/MnMatrix.h"
 
namespace ROOT {
 
   namespace Minuit2 {
 
 
 
class FumiliFCNBase;
class MnUserTransformation;
 
class FumiliGradientCalculator : public GradientCalculator {
 
public:
 
  FumiliGradientCalculator(const FumiliFCNBase& fcn, const MnUserTransformation& state, int n) :
    fFcn(fcn),
    fTransformation(state),
    fHessian(MnAlgebraicSymMatrix(n) )
  {}
 
  ~FumiliGradientCalculator() {}
 
  FunctionGradient operator()(const MinimumParameters&) const;
 
  FunctionGradient operator()(const MinimumParameters&,
                              const FunctionGradient&) const;
 
  const MnUserTransformation& Trafo() const {return fTransformation;}
 
  const MnAlgebraicSymMatrix & Hessian() const { return fHessian; }
 
private:
 
  const FumiliFCNBase& fFcn;
  const MnUserTransformation& fTransformation;
  mutable MnAlgebraicSymMatrix fHessian;
 
};
 
  }  // namespace Minuit2
 
}  // namespace ROOT
 
#endif  // ROOT_Minuit2_FumiliGradientCalculator