/usr/include/trilinos/NOX_StatusTest

//@HEADER
// ************************************************************************
//
//            NOX: An Object-Oriented Nonlinear Solver Package
//                 Copyright (2002) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Roger Pawlowski (rppawlo@sandia.gov) or
// Eric Phipps (etphipp@sandia.gov), Sandia National Laboratories.
// ************************************************************************
//  CVS Information
//  $Source$
//  $Author$
//  $Date$
//  $Revision$
// ************************************************************************
//@HEADER

#ifndef NOX_STATUS_DIVERGENCE_H
#define NOX_STATUS_DIVERGENCE_H

#include "NOX_StatusTest_Generic.H"    // base class

// Forward declarations
namespace NOX {
  namespace Solver {
    class Generic;
  }
}

namespace NOX {

namespace StatusTest {

//! Failure test based on a threshold value of the norm of F.
/*!

  This status test returns NOX::StatusTest::Failed if the norm of F exceeds
  a threshold value for n \e consecutive iterations, i.e.

  \f[ \| F \| > {\rm threshold}\f]

  for n \e consecutive iterations, the status is set to
  NOX::StatusTest::Failed and returned. Otherwise, the status is set
  to NOX::StatusTest::Uncoverged and returned.  Both n and the
  threshold are specified in the constructor, by \c n and \c thresh,
  respectively. While a value for \c thresh must be provided,  a default
  value of \c n = 1 is assumed.

*/
class Divergence : public Generic {

public:

  //! Constructor.
  /*!
    \param thresh - Threshold for divergence test
    \param n - Number of consecutive nonlinear iterations
   */
  Divergence(double thresh, int n = 1);

  //! Destructor.
  virtual ~Divergence();

  /*!
    \brief Tests the stopping criterion.

    \note
    The nature of this test is such that it \e must be executed at
    every nonlinear iteration, so we don't use the checkType argument.
   */
  virtual NOX::StatusTest::StatusType
  checkStatus(const NOX::Solver::Generic& problem,
          NOX::StatusTest::CheckType checkType);

  virtual NOX::StatusTest::StatusType getStatus() const;

  virtual std::ostream& print(std::ostream& stream, int indent = 0) const;

  /*!
    \brief Returns the user-specified number of steps that can
    consecutively fail the threshold test before the test returns a
    failed status.
  */
  virtual int getMaxNumSteps() const;

  //! Returns the current number of steps that have consecutively failed the threshold test.
  virtual int getCurrentNumSteps() const;

  //! Returns the user-specified threshold.
  virtual double getThreshold() const;

private:

  //! User supplied value of n.
  int maxSteps;

  //! Current number of consecutive nonlinear iterations that have failed the specified threshold.
  int numSteps;

  //! The last nonlinear iteration index.
  /*! This is used to prevent counting a step multiple times if by chance
    the status test is called multiple times between iterations.
  */
  int lastIteration;

  //! User specified threshold.
  double threshold;

  //! %Status
  NOX::StatusTest::StatusType status;


};

} // namespace Status
} // namespace NOX

#endif
libtrilinos-nox-dev 12.10.1-3 / usr / include / trilinos / NOX_StatusTest_Divergence.H
