Class Attributes

java.lang.Object

Attributes

public class Attributes
extends java.lang.Object

Stores information for attributes for data sets for machine learning.

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.ArrayList<Attribute>	attributes a list of attributes
private int	classIndex stores the position of the class label
private boolean	hasNumericAttributes a flag indicating that the data set has one or more numeric attributes

Constructor Summary

Constructors

Constructor and Description
Attributes() Default constructor.

Method Summary

Modifier and Type	Method and Description
void	add(Attribute attribute) Adds a new attribute to this set of attributes.
Attribute	get(int i) Returns the ith attribute in this set of attributes.
Attribute	getClassAttribute() Returns the class attribute.
int	getClassIndex() Returns the index of the class label.
boolean	getHasNumericAttributes() Returns true if this set of attributes has one or more numeric attributes; returns false otherwise.
int	getIndex(java.lang.String name) Returns the attribute's index.
static void	main(java.lang.String[] args) A main method for testing.
void	parse(java.util.Scanner scanner) Parses the attribute declarations in the specified scanner.
void	setClassIndex(int classIndex) Sets the class index for this set of attributes.
int	size() Returns the number of attributes.
java.lang.String	toString() Returns a string representation of this Attributes object.

Methods inherited from class java.lang.Object

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

Field Detail

attributes

private java.util.ArrayList<Attribute> attributes

a list of attributes

hasNumericAttributes

private boolean hasNumericAttributes

a flag indicating that the data set has one or more numeric attributes

classIndex

private int classIndex

stores the position of the class label

Constructor Detail

Attributes

Attributes()

Default constructor.

Method Detail

add

public void add(Attribute attribute)

Adds a new attribute to this set of attributes.

Parameters:

attribute - the attribute's name

getClassIndex

public int getClassIndex()

Returns the index of the class label.

Returns:

the index of the class label

getHasNumericAttributes

public boolean getHasNumericAttributes()

Returns true if this set of attributes has one or more numeric attributes; returns false otherwise.

Returns:

true if this set of attributes has numeric attributes

get

public Attribute get(int i)

Returns the ith attribute in this set of attributes.

Parameters:

i - the index of the specified attribute

Returns:

the ith Attribute

getClassAttribute

public Attribute getClassAttribute()

Returns the class attribute.

Returns:

the class attribute

getIndex

public int getIndex(java.lang.String name)
             throws java.lang.Exception

Returns the attribute's index.

Parameters:

name - the attribute's name

Returns:

the attribute's position in the names array

Throws:

java.lang.Exception - if the attribute does not exist

size

public int size()

Returns the number of attributes.

Returns:

the number of attributes

parse

public void parse(java.util.Scanner scanner)
           throws java.lang.Exception

Parses the attribute declarations in the specified scanner. By convention, the last attribute is the class label after parsing.

Parameters:

scanner - a Scanner containing the data set's tokens

Throws:

java.lang.Exception - if a parse exception occurs

setClassIndex

public void setClassIndex(int classIndex)
                   throws java.lang.Exception

Sets the class index for this set of attributes.

Parameters:

classIndex - the new class index

Throws:

java.lang.Exception - if the class index is out of of bounds

toString

public java.lang.String toString()

Returns a string representation of this Attributes object.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this Attributes object

main

public static void main(java.lang.String[] args)

A main method for testing.

Parameters:

args - command-line arguments