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NOX::Solver::LineSearchBased Class Reference

Nonlinear solver based on a line search (i.e., damping) More...

#include <NOX_Solver_LineSearchBased.H>

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Public Member Functions

 LineSearchBased (const Teuchos::RCP< NOX::Abstract::Group > &grp, const Teuchos::RCP< NOX::StatusTest::Generic > &tests, const Teuchos::RCP< Teuchos::ParameterList > &params)
 Constructor. More...
 
virtual ~LineSearchBased ()
 Destructor.
 
virtual void reset (const NOX::Abstract::Vector &initialGuess, const Teuchos::RCP< NOX::StatusTest::Generic > &tests)
 Resets the solver, sets a new status test, and sets a new initial guess.
 
virtual void reset (const NOX::Abstract::Vector &initialGuess)
 Resets the solver and sets a new initial guess.
 
virtual void reset ()
 Resets the solver for another solve. This resets the counters and status only. Uses the final solution from the last solve as the initial guess for the next solve. More...
 
virtual NOX::StatusTest::StatusType step ()
 Do one nonlinear step in the iteration sequence and return status.
 
virtual NOX::StatusTest::StatusType solve ()
 Solve the nonlinear problem and return final status. More...
 
virtual const
NOX::Abstract::Group
getSolutionGroup () const
 Return a reference to the current solution group.
 
virtual const
NOX::Abstract::Group
getPreviousSolutionGroup () const
 Return a reference to the previous solution group.
 
virtual NOX::StatusTest::StatusType getStatus () const
 Returns the current status of the solver.
 
virtual int getNumIterations () const
 Get number of iterations.
 
virtual const
Teuchos::ParameterList
getList () const
 Return a reference to the solver parameters.
 
virtual double getStepSize () const
 
virtual Teuchos::RCP< const
NOX::Abstract::Group
getSolutionGroupPtr () const
 Return a RCP to the solution group.
 
virtual Teuchos::RCP< const
NOX::Abstract::Group
getPreviousSolutionGroupPtr () const
 Return a RCP to the previous solution group.
 
virtual Teuchos::RCP< const
Teuchos::ParameterList
getListPtr () const
 Return a RCP to the solver parameters.
 
virtual Teuchos::RCP< const
NOX::SolverStats
getSolverStatistics () const
 Return a RCP to the solver statistics.
 
- Public Member Functions inherited from NOX::Solver::Generic
 Generic ()
 Constructor (does nothing)
 
virtual ~Generic ()
 Destructor (does nothing)
 

Protected Member Functions

virtual void init ()
 Print out initialization information and calcuation the RHS.
 
virtual void printUpdate ()
 Prints the current iteration information.
 

Protected Attributes

Teuchos::RCP< NOX::GlobalDataglobalDataPtr
 Pointer to the global data object.
 
Teuchos::RCP< NOX::UtilsutilsPtr
 Utils.
 
Teuchos::RCP
< NOX::Abstract::Group
solnPtr
 Current solution.
 
Teuchos::RCP
< NOX::Abstract::Group
oldSolnPtr
 Previous solution pointer.
 
Teuchos::RCP
< NOX::Abstract::Vector
dirPtr
 Current search direction pointer.
 
Teuchos::RCP
< NOX::StatusTest::Generic
testPtr
 Stopping test.
 
Teuchos::RCP
< Teuchos::ParameterList
paramsPtr
 Input parameters.
 
Teuchos::RCP
< NOX::LineSearch::Generic
lineSearchPtr
 Linesearch.
 
Teuchos::RCP
< NOX::Direction::Generic
directionPtr
 Search Direction.
 
double stepSize
 Current step.
 
int nIter
 Number of nonlinear iterations.
 
NOX::StatusTest::StatusType status
 Status of nonlinear solver.
 
NOX::StatusTest::CheckType checkType
 Type of check to use for status tests. See NOX::StatusTest for more details.
 
Teuchos::RCP< NOX::Observerobserver
 Pointer to a user defined NOX::Observer object.
 

Detailed Description

Nonlinear solver based on a line search (i.e., damping)

Solves $F(x)=0$ using an iterative line-search-based method.

Each iteration, the solver does the following.

The iterations progress until the status tests (see NOX::StatusTest) determine either failure or convergence.

Note
To support several line searches and status tests, this version of the solver has a getStepSize() function that returns $\lambda$.

Input Parameters

The following parameter list entries are valid for this solver:

Output Parameters

Every time solve() is called, a sublist for output parameters called "Output" will be created and contain the following parameters.

"Output":

Author
Tammy Kolda (SNL 8950), Roger Pawlowski (SNL 9233)

Constructor & Destructor Documentation

NOX::Solver::LineSearchBased::LineSearchBased ( const Teuchos::RCP< NOX::Abstract::Group > &  grp,
const Teuchos::RCP< NOX::StatusTest::Generic > &  tests,
const Teuchos::RCP< Teuchos::ParameterList > &  params 
)

Constructor.

See reset(NOX::Abstract::Group&, NOX::StatusTest::Generic&, Teuchos::ParameterList&) for description

References NOX::DeepCopy, globalDataPtr, init(), observer, NOX::Solver::parseObserver(), Teuchos::rcp(), NOX::ShapeCopy, Teuchos::ParameterList::sublist(), utilsPtr, and NOX::Solver::validateSolverOptionsSublist().

Member Function Documentation

void NOX::Solver::LineSearchBased::reset ( )
virtual

Resets the solver for another solve. This resets the counters and status only. Uses the final solution from the last solve as the initial guess for the next solve.

NOTE: All NOX solvers will call reset() automatically at teh beginning of the solve() method. We add the reset() method to the solver interface for the application to call in case the application needs to reset counters and status manually before the next call to solve() is made.

Implements NOX::Solver::Generic.

References NOX::StatusTest::Unconverged.

NOX::StatusTest::StatusType NOX::Solver::LineSearchBased::solve ( )
virtual

Solve the nonlinear problem and return final status.

By "solve", we call iterate() until the NOX::StatusTest value is either NOX::StatusTest::Converged or NOX::StatusTest::Failed.

Implements NOX::Solver::Generic.

References Teuchos::ParameterList::set(), Teuchos::ParameterList::sublist(), and NOX::StatusTest::Unconverged.


The documentation for this class was generated from the following files: