com.mockturtlesolutions.snifflib.pde

Class StrangSplitter

java.lang.Object

com.mockturtlesolutions.snifflib.pde.StrangSplitter

All Implemented Interfaces:

NamedParameters, FractionalStep, PartialDifferentialEquation

public class StrangSplitter
extends java.lang.Object
implements FractionalStep

Strang splitting scheduler for the solution of time-evolving problems. Strang splitting is synominous with fractional time step. Note that any StrangSlitter can also be a FractionalStep since StrangSplitter implements FractionalStep. Thus, Strang splitting schemes may be nested.

Constructor Summary

Constructors

Constructor and Description
StrangSplitter() Constructs a StrangSplitting.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(FractionalStep s, DblMatrix fractional) Add a StrangStage to the end of the queue.
void	add(FractionalStep s, DblMatrix fractional, int j) Insert a StrangStage at the jth position in the queue.
int	getDimension()
DblMatrix	getParam(java.lang.String name)
DblMatrix	getSolution()
DblMatrix	getStep() Get the current time step.
int	getSteps()
DblMatrix	getTime()
DblMatrix	getTstart()
DblMatrix	getTstop()
boolean	hasParameter(java.lang.String name)
java.lang.String[]	parameterSet()
void	remove(int j) Remove jth stage from queue.
void	replaceParams(DblParamSet P)
void	run()
void	setInitialCondition(DblMatrix uu)
void	setInitialCondition(InitialCondition fun)
void	setParam(java.lang.String name, DblMatrix value)
void	setStep(DblMatrix t) Set the time step.
void	setSteps(int N) Sets the number of grand steps to be taken.
void	setSymmetric(boolean v) Setting to true causes the scheduler to interpret the stages as the first half of a symmetric sequence.
void	setTime(DblMatrix t)
void	setTstart(DblMatrix t)
void	setTstop(DblMatrix t)
void	solve()
boolean	timeConserved() Returns true if the sum of al fractional steps is exactly 1 and false otherwise.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StrangSplitter

public StrangSplitter()

Constructs a StrangSplitting.

Method Detail

timeConserved

public boolean timeConserved()

Returns true if the sum of al fractional steps is exactly 1 and false otherwise.

getTime

public DblMatrix getTime()

Specified by:

getTime in interface FractionalStep

setTime

public void setTime(DblMatrix t)

Specified by:

setTime in interface FractionalStep

setTstart

public void setTstart(DblMatrix t)

setInitialCondition

public void setInitialCondition(DblMatrix uu)

Specified by:

setInitialCondition in interface FractionalStep

setInitialCondition

public void setInitialCondition(InitialCondition fun)

Specified by:

setInitialCondition in interface FractionalStep

getSolution

public DblMatrix getSolution()

Specified by:

getSolution in interface PartialDifferentialEquation

getTstart

public DblMatrix getTstart()

setTstop

public void setTstop(DblMatrix t)

setStep

public void setStep(DblMatrix t)

Set the time step. Note that this will override any time step determined by setting Nsteps, tstart and tstop.

Specified by:

setStep in interface FractionalStep

getStep

public DblMatrix getStep()

Get the current time step.

Specified by:

getStep in interface FractionalStep

getTstop

public DblMatrix getTstop()

setSymmetric

public void setSymmetric(boolean v)

Setting to true causes the scheduler to interpret the stages as the first half of a symmetric sequence. The order of the stages is reversed during a second half time step. If false, the sequence is run exactly as entered for a full time step.

setSteps

public void setSteps(int N)

Sets the number of grand steps to be taken. Each stage is run over a fraction of this resulting grand step size.

getSteps

public int getSteps()

add

public void add(FractionalStep s,
       DblMatrix fractional)

Add a StrangStage to the end of the queue.

getDimension

public int getDimension()

Specified by:

getDimension in interface PartialDifferentialEquation

add

public void add(FractionalStep s,
       DblMatrix fractional,
       int j)

Insert a StrangStage at the jth position in the queue.

remove

public void remove(int j)

Remove jth stage from queue.

solve

public void solve()

Specified by:

solve in interface PartialDifferentialEquation

getParam

public DblMatrix getParam(java.lang.String name)

Specified by:

getParam in interface NamedParameters

hasParameter

public boolean hasParameter(java.lang.String name)

Specified by:

hasParameter in interface NamedParameters

setParam

public void setParam(java.lang.String name,
            DblMatrix value)

Specified by:

setParam in interface NamedParameters

parameterSet

public java.lang.String[] parameterSet()

Specified by:

parameterSet in interface NamedParameters

replaceParams

public void replaceParams(DblParamSet P)

Specified by:

replaceParams in interface NamedParameters

run

public void run()
         throws SnifflibPdeException

Throws:

SnifflibPdeException