edu.stanford.math.plex

Class Cone

java.lang.Object

edu.stanford.math.plex.SimplexStream

edu.stanford.math.plex.Cone

All Implemented Interfaces:

java.lang.Iterable<Simplex>, java.util.Iterator<Simplex>

public class Cone
extends SimplexStream

The class Cone provides support for computing persistence across a filtration as well as a cone over this filtration. This has uses in computing relative homology as well as in computing cohomology and relative cohomology. See de Silva-Vejdemo Johansson (forthcoming) for details.

Nested Class Summary

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

SimplexStream.ComparisonType, SimplexStream.Head, SimplexStream.Stack, SimplexStream.Tail

Field Summary

Fields

Modifier and Type	Field and Description
protected int	conepoint
protected boolean	coning
protected int	findexOffset
protected java.util.Iterator<Simplex>	ssiterator
protected SimplexStream	sstream
protected java.util.HashMap<java.lang.Integer,java.lang.Boolean>	support

Constructor Summary

Constructors

Constructor and Description
Cone(SimplexStream sstr) Creates a new cone from an existing SimplexStream.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasNext() Is there a next Simplex in the stream?
java.util.Iterator<Simplex>	iterator()
int	maxDimension() Max dimension of simplices in the stream.
Simplex	next() Next Simplex in the stream.
int	size() How many simplices are in the stream?

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

convert_filtration_index, convertInterval, convertInterval, remove, verify

Methods inherited from class java.lang.Object

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

Field Detail

sstream

protected SimplexStream sstream

coning

protected boolean coning

conepoint

protected int conepoint

ssiterator

protected java.util.Iterator<Simplex> ssiterator

support

protected java.util.HashMap<java.lang.Integer,java.lang.Boolean> support

findexOffset

protected int findexOffset

Constructor Detail

Cone

public Cone(SimplexStream sstr)

Creates a new cone from an existing SimplexStream.

Parameters:

sstr - Simplex Stream to be coned.

Method Detail

hasNext

public boolean hasNext()

Description copied from class: SimplexStream

Is there a next Simplex in the stream?

Specified by:

hasNext in interface java.util.Iterator<Simplex>

Specified by:

hasNext in class SimplexStream

Returns:

Return true if the stream is not yet empty.

next

public Simplex next()

Description copied from class: SimplexStream

Next Simplex in the stream.

Specified by:

next in interface java.util.Iterator<Simplex>

Specified by:

next in class SimplexStream

Returns:

Return the smallest remaining Simplex instance.

size

public int size()

Description copied from class: SimplexStream

How many simplices are in the stream?

Specified by:

size in class SimplexStream

Returns:

The number of simplices in the stream.

maxDimension

public int maxDimension()

Description copied from class: SimplexStream

Max dimension of simplices in the stream.

Specified by:

maxDimension in class SimplexStream

Returns:

Max dimension of simplices in the stream.

iterator

public java.util.Iterator<Simplex> iterator()