de.torstennahm.integrate.sparse.evaluateindex
Class DeltaWeightEvaluator

java.lang.Object
  de.torstennahm.integrate.sparse.evaluateindex.DeltaWeightEvaluator

All Implemented Interfaces:

Evaluator

public class DeltaWeightEvaluator
extends java.lang.Object
implements Evaluator

Performs index evaluation using delta quadrature formulas generated from a quadrature formula generator. The delta quadrature formulas are generated based on the given generator, and integration is performed with the tensor product of the delta quadrature formulas. This class is thread-safe.

Author:

Torsten Nahm

Constructor Summary

DeltaWeightEvaluator(de.torstennahm.math.Function function, Generator generator)
Constructs the evaluator.

Method Summary

boolean	canEvaluate(Index index) Returns whether the index evaluator can evaluate the given index.
double	deltaEvaluate(Index index) Evaluates the integration function for the given integration index.
int	dimension() Returns the dimension with which this index evaluator works.
int	pointsForIndex(Index index) Returns the number of points the function needs to be evaluated at for this index.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DeltaWeightEvaluator

public DeltaWeightEvaluator(de.torstennahm.math.Function function,
                            Generator generator)

Constructs the evaluator.

Parameters:

function - function to be integrated

generator - quadrature formula generator

Method Detail

dimension

public int dimension()

Description copied from interface: Evaluator

Returns the dimension with which this index evaluator works. The value 0 means the dimension is indeterminate.

Specified by:

dimension in interface Evaluator

Returns:

dimension for the index evaluator

deltaEvaluate

public double deltaEvaluate(Index index)
                     throws IntegrationFailedException

Description copied from interface: Evaluator

Evaluates the integration function for the given integration index.

Specified by:

deltaEvaluate in interface Evaluator

Parameters:

index - integration index

Returns:

index contribution

Throws:

IntegrationFailedException - if an integration error occurs

canEvaluate

public boolean canEvaluate(Index index)

Description copied from interface: Evaluator

Returns whether the index evaluator can evaluate the given index. For example, if an underlying quadrature formula generator does not support the required number of nodes, evaluation of the index is not possible. Calling evaluateIndex on an index for which this method returns false will produce an IntegrationFailedException. This method returns false exactly if neededEvaluations returns 0.

Specified by:

canEvaluate in interface Evaluator

Parameters:

index - index

Returns:

true if the index can be evaluated

pointsForIndex

public int pointsForIndex(Index index)

Description copied from interface: Evaluator

Returns the number of points the function needs to be evaluated at for this index.

Specified by:

pointsForIndex in interface Evaluator

Parameters:

index - integration index

Returns:

number of function calls; 0 is returned if the evaluation of this index is not possible

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object