Package elki.distance.timeseries

Class ERPDistance

java.lang.Object

elki.distance.AbstractNumberVectorDistance

elki.distance.timeseries.AbstractEditDistance

elki.distance.timeseries.DTWDistance

elki.distance.timeseries.ERPDistance

All Implemented Interfaces:

Distance<NumberVector>, NumberVectorDistance<NumberVector>, PrimitiveDistance<NumberVector>

@Title("Edit Distance with Real Penalty")
@Reference(authors="L. Chen, R. Ng",
           title="On the marriage of Lp-norms and edit distance",
           booktitle="Proc. 13th Int. Conf. on Very Large Data Bases (VLDB \'04)",
           url="http://www.vldb.org/conf/2004/RS21P2.PDF",
           bibkey="DBLP:conf/vldb/ChenN04")
public class ERPDistance
extends DTWDistance

Edit Distance With Real Penalty distance for numerical vectors.

Reference:

L. Chen and R. Ng
On the marriage of Lp-norms and edit distance
Proc. 13th Int. Conf. on Very Large Data Bases (VLDB '04)

Since:

0.2

Author:

Thomas Bernecker

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ERPDistance.Par	Parameterization class.

Field Summary

Fields

Modifier and Type	Field	Description
private double	g	Gap value.

Fields inherited from class elki.distance.timeseries.AbstractEditDistance

bandSize

Constructor Summary

Constructors

Constructor	Description
ERPDistance(double bandSize, double g)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected double	delta(double val1, double val2)	Compute the delta of two values.
double	distance(NumberVector v1, NumberVector v2)	Computes the distance between two given vectors according to this distance function.
boolean	equals(java.lang.Object obj)
protected void	firstRow(double[] buf, int band, NumberVector v1, NumberVector v2, int dim2)	Fill the first row.
int	hashCode()

Methods inherited from class elki.distance.timeseries.AbstractEditDistance

effectiveBandSize, getInputTypeRestriction

Methods inherited from class elki.distance.AbstractNumberVectorDistance

dimensionality, dimensionality, dimensionality, dimensionality, dimensionality, dimensionality, dimensionality, dimensionality

Methods inherited from class java.lang.Object

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

Methods inherited from interface elki.distance.Distance

isMetric, isSquared, isSymmetric

Methods inherited from interface elki.distance.PrimitiveDistance

instantiate

Field Detail

g

private final double g

Gap value.

Constructor Detail

ERPDistance

public ERPDistance(double bandSize,
                   double g)

Constructor.

Parameters:

bandSize - Band size

g - G parameter

Method Detail

distance

public double distance(NumberVector v1,
                       NumberVector v2)

Description copied from interface: NumberVectorDistance

Computes the distance between two given vectors according to this distance function.

Specified by:

distance in interface NumberVectorDistance<NumberVector>

Specified by:

distance in interface PrimitiveDistance<NumberVector>

Overrides:

distance in class DTWDistance

Parameters:

v1 - first vector

v2 - second vector

Returns:

the distance between two given vectors according to this distance function

firstRow

protected void firstRow(double[] buf,
                        int band,
                        NumberVector v1,
                        NumberVector v2,
                        int dim2)

Description copied from class: DTWDistance

Fill the first row.

Overrides:

firstRow in class DTWDistance

Parameters:

buf - Buffer

band - Bandwidth

v1 - First vector

v2 - Second vector

dim2 - Dimensionality of second

delta

protected double delta(double val1,
                       double val2)

Description copied from class: DTWDistance

Compute the delta of two values.

TODO: support Euclidean, Manhattan, others?

Overrides:

delta in class DTWDistance

Parameters:

val1 - First value

val2 - Second value

Returns:

Difference

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class AbstractEditDistance

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractEditDistance