classifier

Class GroupMeans

java.lang.Object

classifier.GroupMeans

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class GroupMeans
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable

Many classification functions need the mean values of each parameter from a group of training data.

This class provides a set of functions which will get the means by group, and also return larger matrixes of the mean values repeated by a grouping index or repeated for a single group which can be used in classifier training and classifier application

Author:

Doug Gillespie

See Also:

Matrix, Serialized Form

Constructor Summary

Constructors

Constructor and Description
GroupMeans(Jama.Matrix data, int[] group) Constructor works out the number of unique groups in group and then constructs a smaller matrix of means of each parameter by group.

Method Summary

Methods

Modifier and Type	Method and Description
GroupMeans	clone()
static int	getGroupIndex(int[] uniqueGroups, int iD) Gets the index of a group id (these will often be the same !)
static int[]	getGroupIndex(int[] uniqueGroups, int[] iD) Gets the index of a group id (these will often be the same !)
Jama.Matrix	getGroupMeans()
Jama.Matrix	getGroupMeans(int[] groups) Create a matrix of means, repeated multiple times (e.g.
Jama.Matrix	getGroupMeans(int group, int n) Create a matrix of means for a single group.
int[]	getGroupSize()
int	getNumGroups()
int[]	getUniqueGroups() Get list of unique groups in the data
static int[]	unique(int[] groups) Get a unique list of items in the training group

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupMeans

public GroupMeans(Jama.Matrix data,
          int[] group)

Constructor works out the number of unique groups in group and then constructs a smaller matrix of means of each parameter by group.

Parameters:

data - matrix of training data

group - group indexes

Method Detail

getGroupMeans

public Jama.Matrix getGroupMeans()

Returns:

matrix of means by training group

getUniqueGroups

public int[] getUniqueGroups()

Get list of unique groups in the data

Returns:

list of unique groups in the data

getGroupSize

public int[] getGroupSize()

Returns:

the number of entries in each group.

getNumGroups

public int getNumGroups()

Returns:

The number of unique groups in the data

getGroupMeans

public Jama.Matrix getGroupMeans(int[] groups)

Create a matrix of means, repeated multiple times (e.g. so it can be subtracted off a set of training data).

Parameters:

groups - grouping to apply. Must contain only the same entries as in the group parameter passed to the constructor.

Returns:

matrix of grouped means.

getGroupMeans

public Jama.Matrix getGroupMeans(int group,
                        int n)

Create a matrix of means for a single group.

Parameters:

group - index of group

n - number of rows of data to create

Returns:

matrix with n identical rows of group

getGroupIndex

public static int getGroupIndex(int[] uniqueGroups,
                int iD)

Gets the index of a group id (these will often be the same !)

Parameters:

uniqueGroups - list of unique groups (sorted)

iD - group ID to find

Returns:

index in group list.

getGroupIndex

public static int[] getGroupIndex(int[] uniqueGroups,
                  int[] iD)

Gets the index of a group id (these will often be the same !)

Parameters:

uniqueGroups - sorted list of unique groups

iD - list of group id's to find indexes of

Returns:

list of indexes.

unique

public static int[] unique(int[] groups)

Get a unique list of items in the training group

e.g. if group was {1, 9, 3, 1, 4, 9, 4} then the return value would be {1, 3, 4, 9}

Parameters:

groups - group data which will contain many instances of few different values.

Returns:

a shorter array of unique values sorted by size.

clone

public GroupMeans clone()

Overrides:

clone in class java.lang.Object