#ifndef NUMOPTIMISEDESCENTB_HH
#define NUMOPTIMISEDESCENTB_HH
////////////////////////////////////////////////////////////////////////////
//! author="Robert Crida"
//! lib=NumOptimise
//! date="10/2/1998"
//! userlevel=Develop
//! file="amma/PatternRec/Optimise/NumOptimiseDescentB.hh"
//! docentry="Optimisation.Implementation;Numerical Methods.Optimisation.Implementation"
//! rcsid="$Id: NumOptimiseDescentB.hh,v 1.12 2000/06/26 16:47:53 ees1rr Exp $"

#include "amma/Num/NumOptimiseB.hh"

// --------------------------------------------------------------------------
// **********  NumOptimiseDescentBC  ****************************************
// --------------------------------------------------------------------------
//: Gradient descent optimiser implementation class.
//
// This is the implementation class of the gradient descent optimiser for the
// PatternRec toolbox. The NumOptimiseDescentC handle class should be used.

class NumOptimiseDescentBC: public NumOptimiseBC
{
  UIntT _iterations;
  RealT _tolerance;

public:
  NumOptimiseDescentBC (UIntT iterations, RealT tolerance);
  //: Constructor requires the number of iterations to use

  NumOptimiseDescentBC (istream &in);
  //: Constructs from stream

  NumOptimiseDescentBC (const NumOptimiseDescentBC &oth);
  //: Copy constructor

  virtual BodyRefCounterVC & Copy () const;
  //: Makes a deep copy and is virtual

protected:
  VectorC MinimalX (const NumCostC &domain);
  //: Determines Xmin=arg min_{X} |f(X)-Yd|

  virtual const StringC GetInfo () const;
  //: Prints information about the optimiser

  virtual BooleanT Save (ostream &out) const;
  //: Writes object to stream, can be loaded using constructor

  friend class NumOptimiseDescentC;
  //: Handle class
};

#endif