de.torstennahm.integrate.quadratureformula
Class DeltaGenerator

java.lang.Object
  de.torstennahm.integrate.quadratureformula.AbstractCachedGenerator
      de.torstennahm.integrate.quadratureformula.DeltaGenerator

All Implemented Interfaces:

Generator

public class DeltaGenerator
extends AbstractCachedGenerator

This generator takes an underlying quadrature formula generator, producing a corresponding generator for delta integration. Let wrapped be the underlying generator. Then, for or a given level l, this.getByLevel(l) will return a quadrature formula representing the difference between wrapped.getByLevel(l) minus wrapped.getByLevel(l-1). In the special case of l equals 0, wrapped.getByLevel(0) is returned.

The DeltaWrapper generator supports only the getByLevel method, as the getByNodes method does not make sense for delta integration.

According to general Generator contract, this class is thread-safe.

Author:

Torsten Nahm

Field Summary

Fields inherited from class de.torstennahm.integrate.quadratureformula.AbstractCachedGenerator

levelCache, weightsCache

Constructor Summary

DeltaGenerator(Generator generator)
Creates the DeltaGenerator.

Method Summary

QuadratureFormula	generateByLevel(int level) Returns the quadrature formula representing the difference between quadrature formula produced by the underlying generator for the specified level and the specified level minus 1.
QuadratureFormula	generateByNodes(int nodesRequested) This method is not supported, as delta integration only makes sense between successive levels of quadrature formulas.
int	maxLevel() Returns the maximum argument supported by getByLevel.
int	maxNodes() This method is not supported, as delta integration only makes sense between successive levels of quadrature formulas.
java.lang.String	toString()

Methods inherited from class de.torstennahm.integrate.quadratureformula.AbstractCachedGenerator

getByLevel, getByNodes

Methods inherited from class java.lang.Object

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

Constructor Detail

DeltaGenerator

public DeltaGenerator(Generator generator)

Creates the DeltaGenerator.

Parameters:

generator - generator for which the delta quadrature formula are to be calculated

Method Detail

maxLevel

public int maxLevel()

Description copied from interface: Generator

Returns the maximum argument supported by getByLevel.

Returns:

maximum level, or -1 for no maximum

generateByNodes

public QuadratureFormula generateByNodes(int nodesRequested)

This method is not supported, as delta integration only makes sense between successive levels of quadrature formulas.

Specified by:

generateByNodes in class AbstractCachedGenerator

Throws:

java.lang.UnsupportedOperationException

maxNodes

public int maxNodes()

This method is not supported, as delta integration only makes sense between successive levels of quadrature formulas.

Returns:

maximum number of nodes, or -1 for no maximum

Throws:

java.lang.UnsupportedOperationException

generateByLevel

public QuadratureFormula generateByLevel(int level)

Returns the quadrature formula representing the difference between quadrature formula produced by the underlying generator for the specified level and the specified level minus 1. If level is 0, the unmodified weights for level 0 are returned.

Specified by:

generateByLevel in class AbstractCachedGenerator

Returns:

delta quadrature formula for the specified level

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object