IRPact_modellierung.helper

Class MetricHelper

java.lang.Object

IRPact_modellierung.helper.MetricHelper

public class MetricHelper
extends java.lang.Object

This class used to calculate distances between two vectors, implementing p-metrics (explicitly euclidean, manhattan and maximum metric as well). If instantiated, a string for the chosen metric is used (currentMetric), that needs to be set every time the metric is changed.

Constructor Summary

Constructors

Constructor and Description
MetricHelper()

Method Summary

Modifier and Type	Method and Description
static double	calculateDistance(double p, java.awt.geom.Point2D a, java.awt.geom.Point2D b) Calculates the (2-dimensional) p-distance between the vectors a and b
static double	calculateDistance(java.awt.geom.Point2D a, java.awt.geom.Point2D b, java.lang.String metric) Calculates the (2-dimensional) distance between the vectors a and b according to currentMetric
static double	euclidianDistance(java.awt.geom.Point2D a, java.awt.geom.Point2D b) Calculates the (2-dimensional) euclidian distance between the vectors a and b
static double	manhattanDistance(java.awt.geom.Point2D a, java.awt.geom.Point2D b) Calculates the (2-dimensional) manhattan/taxicab distance between the vectors a and b
static double	maximumDistance(java.awt.geom.Point2D a, java.awt.geom.Point2D b) Calculates the (2-dimensional) maximum distance between the vectors a and b
static double	pDistance(double p, java.awt.geom.Point2D a, java.awt.geom.Point2D b) Calculates the (2-dimensional) p-distance between the vectors a and b

Methods inherited from class java.lang.Object

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

Constructor Detail

MetricHelper

public MetricHelper()

Method Detail

calculateDistance

public static double calculateDistance(java.awt.geom.Point2D a,
                                       java.awt.geom.Point2D b,
                                       java.lang.String metric)
                                throws java.lang.IllegalStateException

Calculates the (2-dimensional) distance between the vectors a and b according to currentMetric

Parameters:

a - vector between which the metric is calculated

b - vector between which the metric is calculated

metric -

Returns:

the value of the distance function between a and b in the current metric

Throws:

java.lang.IllegalStateException - gets thrown when currentMetric is either not set or set to a value that is not implemented

calculateDistance

public static double calculateDistance(double p,
                                       java.awt.geom.Point2D a,
                                       java.awt.geom.Point2D b)
                                throws java.lang.IllegalArgumentException

Calculates the (2-dimensional) p-distance between the vectors a and b

Parameters:

a - (2-dimensional) vector between which the metric is calculated

b - (2-dimensional) vector between which the metric is calculated

Returns:

the value of the distance function between a and b in the (induced) p-metric

Throws:

java.lang.IllegalArgumentException - gets thrown when p-value is < 1 (and thus not implemented)

manhattanDistance

public static double manhattanDistance(java.awt.geom.Point2D a,
                                       java.awt.geom.Point2D b)

Calculates the (2-dimensional) manhattan/taxicab distance between the vectors a and b

Parameters:

a - (2-dimensional) vector between which the metric is calculated

b - (2-dimensional) vector between which the metric is calculated

Returns:

the value of the distance function between a and b in the manhattan metric

euclidianDistance

public static double euclidianDistance(java.awt.geom.Point2D a,
                                       java.awt.geom.Point2D b)

Calculates the (2-dimensional) euclidian distance between the vectors a and b

Parameters:

a - (2-dimensional) vector between which the metric is calculated

b - (2-dimensional) vector between which the metric is calculated

Returns:

the value of the distance function between a and b in the euclidian metric

maximumDistance

public static double maximumDistance(java.awt.geom.Point2D a,
                                     java.awt.geom.Point2D b)

Calculates the (2-dimensional) maximum distance between the vectors a and b

Parameters:

a - (2-dimensional) vector between which the metric is calculated

b - (2-dimensional) vector between which the metric is calculated

Returns:

the value of the distance function between a and b in the maximum (infinity) metric

pDistance

public static double pDistance(double p,
                               java.awt.geom.Point2D a,
                               java.awt.geom.Point2D b)
                        throws java.lang.IllegalArgumentException

Calculates the (2-dimensional) p-distance between the vectors a and b

Parameters:

a - (2-dimensional) vector between which the metric is calculated

b - (2-dimensional) vector between which the metric is calculated

Returns:

the value of the distance function between a and b in the (induced) p-metric

Throws:

java.lang.IllegalArgumentException - gets thrown when p-value is < 1 (and thus not implemented)