IMinimizer1D.h

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// @(#)root/mathcore:$Id: IMinimizer1D.h 32583 2010-03-12 09:57:42Z moneta $
// Author: David Gonzalez Maline 2/2008
 /**********************************************************************
  *                                                                    *
  * Copyright (c) 2004 Maline,  CERN/PH-SFT                            *
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  * This library is free software; you can redistribute it and/or      *
  * modify it under the terms of the GNU General Public License        *
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// Header file for class Minimizer1D
// 
// Created by: Maline  at Fri Feb  1 11:30:26 2008
// 

#ifndef ROOT_Math_IMinimizer1D
#define ROOT_Math_IMinimizer1D

/**

   @defgroup Min1D One-dimensional Minimization 
   @ingroup NumAlgo
 */

namespace ROOT { 
namespace Math { 

//___________________________________________________________________________________________
/**
   Interface class for numerical methods for one-dimensional minimization

   @ingroup Min1D
  
 */

   class IMinimizer1D {
      
   public: 
      
      IMinimizer1D() {} 
      virtual ~IMinimizer1D() {} 
      
   public: 
      
      /**
       * Return current estimate of the position of the minimum
       */
      virtual double XMinimum() const = 0; 

      /**
       * Return current lower bound of the minimization interval
       */
      virtual double XLower() const = 0; 

      /**
       * Return current upper bound of the minimization interval
       */
      virtual double XUpper() const = 0; 

      /**
       * Return function value at current estimate of the minimum
       */
      virtual double FValMinimum() const = 0; 

      /**
       * Return function value at current lower bound of the minimization interval
       */
      virtual double FValLower() const = 0; 

      /**
       * Return function value at current upper bound of the minimization interval
       */
      virtual double FValUpper() const = 0; 

      /**
       * Find minimum position iterating until convergence specified by the absolute and relative tolerance or
       * the maximum number of iteration is reached
       * Return true if iterations converged successfully
       * \@param maxIter maximum number of iteration
       * \@param absTol desired absolute error in the minimum position
       * \@param absTol desired relative error in the minimum position
       */
      virtual bool Minimize( int maxIter, double absTol, double relTol) = 0; 

      /**
       * Return number of iteration used to find minimum
       */
      virtual int Iterations() const = 0;

      /**
       * Return name of minimization algorithm
       */
      virtual const char * Name() const = 0;  

      /** Returns the status of the previous estimate */
      virtual int Status() const = 0; 


   };  // end class IMinimizer1D
   
} // end namespace Math
   
} // end namespace ROOT

#endif /* ROOT_Math_IMinimizer1D */

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