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 // Created on: 1991-03-14
 // Created by: Laurent PAINNOT
 // Copyright (c) 1991-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _math_NewtonFunctionRoot_HeaderFile
 #define _math_NewtonFunctionRoot_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_OStream.hxx>
 class math_FunctionWithDerivative;
 
 //! This class implements the calculation of a root of a function of
 //! a single variable starting from an initial near guess using the
 //! Newton algorithm. Knowledge of the derivative is required.
 class math_NewtonFunctionRoot
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! The Newton method is done to find the root of the function F
   //! from the initial guess Guess.
   //! The tolerance required on the root is given by Tolerance.
   //! The solution is found when :
   //! abs(Xi - Xi-1) <= EpsX and abs(F(Xi))<= EpsF
   //! The maximum number of iterations allowed is given by NbIterations.
   Standard_EXPORT math_NewtonFunctionRoot(math_FunctionWithDerivative& F,
                                           const double                 Guess,
                                           const double                 EpsX,
                                           const double                 EpsF,
                                           const int                    NbIterations = 100);
 
   //! The Newton method is done to find the root of the function F
   //! from the initial guess Guess.
   //! The solution must be inside the interval [A, B].
   //! The tolerance required on the root is given by Tolerance.
   //! The solution is found when :
   //! abs(Xi - Xi-1) <= EpsX and abs(F(Xi))<= EpsF
   //! The maximum number of iterations allowed is given by NbIterations.
   Standard_EXPORT math_NewtonFunctionRoot(math_FunctionWithDerivative& F,
                                           const double                 Guess,
                                           const double                 EpsX,
                                           const double                 EpsF,
                                           const double                 A,
                                           const double                 B,
                                           const int                    NbIterations = 100);
 
   //! is used in a sub-class to initialize correctly all the fields
   //! of this class.
   Standard_EXPORT math_NewtonFunctionRoot(const double A,
                                           const double B,
                                           const double EpsX,
                                           const double EpsF,
                                           const int    NbIterations = 100);
 
   //! is used internally by the constructors.
   Standard_EXPORT void Perform(math_FunctionWithDerivative& F, const double Guess);
 
   //! Returns true if the computations are successful, otherwise returns false.
   bool IsDone() const;
 
   //! Returns the value of the root of function <F>.
   //! Exception NotDone is raised if the root was not found.
   double Root() const;
 
   //! returns the value of the derivative at the root.
   //! Exception NotDone is raised if the root was not found.
   double Derivative() const;
 
   //! returns the value of the function at the root.
   //! Exception NotDone is raised if the root was not found.
   double Value() const;
 
   //! Returns the number of iterations really done on the
   //! computation of the Root.
   //! Exception NotDone is raised if the root was not found.
   int NbIterations() const;
 
   //! Prints information on the current state of the object.
   Standard_EXPORT void Dump(Standard_OStream& o) const;
 
 private:
   bool   Done;
   double X;
   double Fx;
   double DFx;
   int    It;
   double EpsilonX;
   double EpsilonF;
   int    Itermax;
   double Binf;
   double Bsup;
 };
 
 #include <math_NewtonFunctionRoot.lxx>
 
 #endif // _math_NewtonFunctionRoot_HeaderFile

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