be.hogent.tarsos.lsh.util
Class TestUtils

java.lang.Object
  be.hogent.tarsos.lsh.util.TestUtils

public class TestUtils
extends java.lang.Object

Makes it easy to generate random test data sets.

Author:

Joren Six

Constructor Summary

TestUtils()

Method Summary

static void	addNeighbours(java.util.List<Vector> dataset, int numberOfNeighboursToAdd, double radius) Adds neighbours to each element in a data set.
static java.util.List<Vector>	generate(int dimensions, int datasetSize, int maxValue) Generate a data set.

Methods inherited from class java.lang.Object

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

Constructor Detail

TestUtils

public TestUtils()

Method Detail

generate

public static java.util.List<Vector> generate(int dimensions,
                                              int datasetSize,
                                              int maxValue)

Generate a data set.

Parameters:

dimensions - The number of dimensions of the vector.

datasetSize - The size of the data set.

maxValue - The maximum value of the coordinates of the vectors (a number between 0 and maxValue is chosen randomly).

Returns:

A data set with the properties described above.

addNeighbours

public static void addNeighbours(java.util.List<Vector> dataset,
                                 int numberOfNeighboursToAdd,
                                 double radius)

Adds neighbours to each element in a data set. Each element gets a number of neighbours added. E.g. If a data set has 10 elements and 2 neighbours are added, you end up with 10 + 2 x 10 = 30 elements. Each element is copied and moved slightly according to radius.

Parameters:

dataset - The data set.

numberOfNeighboursToAdd - The number of neighbours to add. E.g. If a data set has 10 elements and 2 neighbours are added, you end up with 10 + 2 x 10 = 30 elements.

radius - The radius used to create neigbours. In each dimension a random number between -radius and +radius is added to the current value.