edu.stanford.math.plex

Class SimplexFaceIterator

java.lang.Object

edu.stanford.math.plex.SimplexFaceIterator

public class SimplexFaceIterator
extends java.lang.Object

The SimplexFaceIterator class.

A SimplexFaceIterator instance makes an iterator that returns all of the faces of a Simplex (specified via a Simplex or a SimplexHandle) in a given dimension range. It also keeps track of the sign of the last one returned, so that this can be used to compute the boundary of a simplex.

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	counter
protected int[]	current
protected int	k
protected int	N
protected int	signOfLast
protected int[]	vertices

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SimplexFaceIterator()
	SimplexFaceIterator(int[] vertices, int dimension) Construct a new iterator for faces of a simplex given by an array.
	SimplexFaceIterator(Simplex s, int dimension) Construct a new iterator for the faces specified dimension.

Method Summary

Methods

Modifier and Type	Method and Description
int	getDimension() Return the dimension of the faces generated by this iterator.
int	getSignOfLast() Return the sign of the last face -- only useful when codimension is 1.
boolean	hasNext()
int[]	next() Get the next face in an iteration of all faces of dimension k.

Methods inherited from class java.lang.Object

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

Field Detail

signOfLast

protected int signOfLast

k

protected final int k

N

protected final int N

vertices

protected final int[] vertices

counter

protected final int[] counter

current

protected final int[] current

Constructor Detail

SimplexFaceIterator

protected SimplexFaceIterator()

SimplexFaceIterator

public SimplexFaceIterator(int[] vertices,
                   int dimension)

Construct a new iterator for faces of a simplex given by an array.

Parameters:

vertices - An int[] specifying the vertices.

dimension - Dimension of the faces we care about.

SimplexFaceIterator

public SimplexFaceIterator(Simplex s,
                   int dimension)

Construct a new iterator for the faces specified dimension.

Parameters:

s - Simplex whose faces are of interest.

dimension - Dimension of the faces we care about (often dimension of the simplex - 1).

Method Detail

hasNext

public boolean hasNext()

next

public int[] next()

Get the next face in an iteration of all faces of dimension k.

Returns:

vertices for the next k-face.

getDimension

public int getDimension()

Return the dimension of the faces generated by this iterator.

getSignOfLast

public int getSignOfLast()

Return the sign of the last face -- only useful when codimension is 1.