weka.datagenerators

Class Test

java.lang.Object

weka.datagenerators.Test

All Implemented Interfaces:

Serializable, RevisionHandler

public class Test
extends Object
implements Serializable, RevisionHandler

Class to represent a test.

The string representation of the test can be supplied in standard notation or for a subset of types of attributes in Prolog notation.
Following examples for all possible tests that can be represented by this class, given in standard notation.

Examples of tests for numeric attributes:
B >= 2.333
B < 4.56

Examples of tests for nominal attributes with more then 2 values:
A = rain
A != rain

Examples of tests for nominal attribute with exactly 2 values:
A = false
A = true


The Prolog notation is only supplied for numeric attributes and for nominal attributes that have the values "true" and "false".

Following examples for the Prolog notation provided.

Examples of tests for numeric attributes:
The same as for standard notation above.

Examples of tests for nominal attributes with values "true"and "false":
A
not(A)

(Other nominal attributes are not supported by the Prolog notation.)

Version:

$Revision: 10203 $

Author:

Gabi Schmidberger (gabi@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Test(int i, double s, Instances dataset) Constructor
Test(int i, double s, Instances dataset, boolean n) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equalTo(Test t) Compares the test with the test that is given as parameter.
Test	getNot() Negates the test.
String	getRevision() Returns the revision string.
boolean	passesTest(Instance inst) Determines whether an instance passes the test.
String	toPrologString() Returns the test represented by a string in Prolog notation.
String	toString() Returns the test represented by a string.

Methods inherited from class java.lang.Object

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

Constructor Detail

Test

public Test(int i,
    double s,
    Instances dataset)

Constructor

Parameters:

i - the attribute index

s - the split

dataset - the dataset

Test

public Test(int i,
    double s,
    Instances dataset,
    boolean n)

Constructor

Parameters:

i - the attribute index

s - the split

dataset - the dataset

n - whether to negate the test

Method Detail

getNot

public Test getNot()

Negates the test.

Returns:

the test itself negated

passesTest

public boolean passesTest(Instance inst)
                   throws Exception

Determines whether an instance passes the test.

Parameters:

inst - the instance

Returns:

true if the instance satisfies the test, false otherwise

Throws:

Exception - if something goes wrong

toString

public String toString()

Returns the test represented by a string.

Overrides:

toString in class Object

Returns:

a string representing the test

toPrologString

public String toPrologString()

Returns the test represented by a string in Prolog notation.

Returns:

a string representing the test in Prolog notation

equalTo

public boolean equalTo(Test t)

Compares the test with the test that is given as parameter.

Parameters:

t - the test the object is compared to

Returns:

true if the two Tests are equal

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision