edu.stanford.math.plex

Class Torus

java.lang.Object

edu.stanford.math.plex.PointData

edu.stanford.math.plex.PointData.NSpace

edu.stanford.math.plex.Torus

public class Torus
extends PointData.NSpace

A Torus instance is discrete simulation of a d-dimensional torus. For testing.

Simplest implementation of a d-dimensional torus. Intended for testing.

Version:

$Id$

Nested Class Summary

Nested classes/interfaces inherited from class edu.stanford.math.plex.PointData

PointData.Discrete, PointData.NSpace, PointData.Predicate

Field Summary

Fields inherited from class edu.stanford.math.plex.PointData

rand

Constructor Summary

Constructors

Constructor and Description
Torus()
Torus(double[] data, int d) Make a Torus with a given data array.
Torus(int n, int d) Make an n-way grid on the unit Torus.

Method Summary

Methods

Modifier and Type	Method and Description
double	coordinate(int p, int i) i-th coordinate of point p;
int	count() The number of data points.
int	dimension() The number of dimensions of the space.
double	distance(int p1, int p2) Toroidal distance.

Methods inherited from class edu.stanford.math.plex.PointData.NSpace

xi

Methods inherited from class edu.stanford.math.plex.PointData

random_points

Methods inherited from class java.lang.Object

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

Constructor Detail

Torus

public Torus(double[] data,
     int d)

Make a Torus with a given data array.

Parameters:

data - double[] of point data.

Torus

public Torus(int n,
     int d)

Make an n-way grid on the unit Torus.

Parameters:

n - grid size parameter

Torus

public Torus()

Method Detail

dimension

public int dimension()

The number of dimensions of the space.

Specified by:

dimension in class PointData.NSpace

Returns:

the dimension of the data.

coordinate

public double coordinate(int p,
                int i)

i-th coordinate of point p;

Specified by:

coordinate in class PointData.NSpace

Parameters:

p - the point

i - the coordinate index

Returns:

i-th coordinate

count

public int count()

The number of data points.

Specified by:

count in class PointData

Returns:

the number of points

distance

public double distance(int p1,
              int p2)

Toroidal distance.

Specified by:

distance in class PointData

Parameters:

p1 - the first point

p2 - the second point

Returns:

the distance between p1 and p2 on the torus.