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e6f550da99
Redundant methods Delete() and Desroy(), created in CDL as a hack to define destructor for the class, are removed; their definitions are converted to definition of destructors. In a couple of places methods Destroy() are preserved (bug made non-virtual) because they are called explicitly.
129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
// Created on: 1991-05-14
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// Created by: Laurent PAINNOT
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// Copyright (c) 1991-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _math_BrentMinimum_HeaderFile
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#define _math_BrentMinimum_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Standard_Handle.hxx>
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#include <Standard_Boolean.hxx>
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#include <Standard_Real.hxx>
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#include <Standard_Integer.hxx>
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#include <Standard_OStream.hxx>
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class StdFail_NotDone;
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class math_Function;
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//! This class implements the Brent's method to find the minimum of
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//! a function of a single variable.
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//! No knowledge of the derivative is required.
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class math_BrentMinimum
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! This constructor should be used in a sub-class to initialize
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//! correctly all the fields of this class.
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Standard_EXPORT math_BrentMinimum(const Standard_Real TolX, const Standard_Integer NbIterations = 100, const Standard_Real ZEPS = 1.0e-12);
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//! This constructor should be used in a sub-class to initialize
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//! correctly all the fields of this class.
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//! It has to be used if F(Bx) is known.
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Standard_EXPORT math_BrentMinimum(const Standard_Real TolX, const Standard_Real Fbx, const Standard_Integer NbIterations = 100, const Standard_Real ZEPS = 1.0e-12);
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//! Destructor
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Standard_EXPORT virtual ~math_BrentMinimum();
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//! Brent minimization is performed on function F from a given
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//! bracketing triplet of abscissas Ax, Bx, Cx (such that Bx is
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//! between Ax and Cx, F(Bx) is less than both F(Bx) and F(Cx))
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//! The solution is found when: abs(Xi - Xi-1) <= TolX * abs(Xi) + ZEPS;
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Standard_EXPORT void Perform (math_Function& F, const Standard_Real Ax, const Standard_Real Bx, const Standard_Real Cx);
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//! This method is called at the end of each iteration to check if the
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//! solution is found.
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//! It can be redefined in a sub-class to implement a specific test to
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//! stop the iterations.
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virtual Standard_Boolean IsSolutionReached (math_Function& theFunction);
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//! Returns true if the computations are successful, otherwise returns false.
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Standard_Boolean IsDone() const;
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//! returns the location value of the minimum.
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//! Exception NotDone is raised if the minimum was not found.
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Standard_Real Location() const;
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//! returns the value of the minimum.
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//! Exception NotDone is raised if the minimum was not found.
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Standard_Real Minimum() const;
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//! returns the number of iterations really done during the
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//! computation of the minimum.
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//! Exception NotDone is raised if the minimum was not found.
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Standard_Integer NbIterations() const;
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//! Prints on the stream o information on the current state
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//! of the object.
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//! Is used to redefine the operator <<.
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Standard_EXPORT void Dump (Standard_OStream& o) const;
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protected:
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Standard_Real a;
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Standard_Real b;
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Standard_Real x;
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Standard_Real fx;
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Standard_Real fv;
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Standard_Real fw;
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Standard_Real XTol;
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Standard_Real EPSZ;
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private:
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Standard_Boolean Done;
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Standard_Integer iter;
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Standard_Integer Itermax;
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Standard_Boolean myF;
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};
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#include <math_BrentMinimum.lxx>
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#endif // _math_BrentMinimum_HeaderFile
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