weka.associations

Class FPGrowth.FrequentItemSets

java.lang.Object

weka.associations.FPGrowth.FrequentItemSets

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

FPGrowth

protected static class FPGrowth.FrequentItemSets
extends java.lang.Object
implements java.io.Serializable

Maintains a list of frequent item sets.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	m_numberOfTransactions The total number of transactions in the data
protected java.util.ArrayList<FPGrowth.FrequentBinaryItemSet>	m_sets The list of frequent item sets

Constructor Summary

Constructors

Constructor and Description
FrequentItemSets(int numTransactions) Constructor.

Method Summary

Modifier and Type	Method and Description
void	addItemSet(FPGrowth.FrequentBinaryItemSet setToAdd) Add an item set.
FPGrowth.FrequentBinaryItemSet	getItemSet(int index) Get an item set.
int	getNumberOfTransactions() Get the total number of transactions in the data that the item sets were derived from.
java.util.Iterator<FPGrowth.FrequentBinaryItemSet>	iterator() Get an iterator that can be used to access all the item sets.
int	size() Get the number of item sets.
void	sort() Sort the item sets.
void	sort(java.util.Comparator<FPGrowth.FrequentBinaryItemSet> comp) Sort the item sets according to the supplied comparator.
java.lang.String	toString(int numSets) Get a textual description of this list of item sets.

Methods inherited from class java.lang.Object

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

Field Detail

m_sets

protected java.util.ArrayList<FPGrowth.FrequentBinaryItemSet> m_sets

The list of frequent item sets

m_numberOfTransactions

protected int m_numberOfTransactions

The total number of transactions in the data

Constructor Detail

FrequentItemSets

public FrequentItemSets(int numTransactions)

Constructor.

Parameters:

numTransactions - the total number of transactions in the data.

Method Detail

getItemSet

public FPGrowth.FrequentBinaryItemSet getItemSet(int index)

Get an item set.

Parameters:

index - the index of the item set to get.

Returns:

an item set.

iterator

public java.util.Iterator<FPGrowth.FrequentBinaryItemSet> iterator()

Get an iterator that can be used to access all the item sets.

Returns:

an iterator.

getNumberOfTransactions

public int getNumberOfTransactions()

Get the total number of transactions in the data that the item sets were derived from.

Returns:

the total number of transactions in the data.

addItemSet

public void addItemSet(FPGrowth.FrequentBinaryItemSet setToAdd)

Add an item set.

Parameters:

setToAdd - the item set to add.

sort

public void sort(java.util.Comparator<FPGrowth.FrequentBinaryItemSet> comp)

Sort the item sets according to the supplied comparator.

Parameters:

comp - the comparator to use.

size

public int size()

Get the number of item sets.

Returns:

the number of item sets.

sort

public void sort()

Sort the item sets. Sorts by item set length. Ties are broken by comparing the items in the two item sets.

toString

public java.lang.String toString(int numSets)

Get a textual description of this list of item sets.

Parameters:

numSets - the number of item sets to display.

Returns:

a textual description of the item sets.