smile.feature

Class DateFeature

java.lang.Object

smile.feature.DateFeature

All Implemented Interfaces:

Feature<double[]>

public class DateFeature
extends Object
implements Feature<double[]>

Date/time feature generator. A date attribute is usually represented by a long value that is the milliseconds since January 1, 1970, 00:00:00 GMT. Such a value is meaningless in data mining in general. One usually extract information such as year, month, day, etc. as features in further analysis.

Author:

Haifeng Li

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DateFeature.Type The types of date/time features.

Constructor Summary

Constructors

Constructor and Description
DateFeature(Attribute[] attributes, DateFeature.Type[] types) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Attribute[]	attributes() Returns the variable attributes of generated features.
double	f(double[] object, int id) Generates a feature for given object.

Methods inherited from class java.lang.Object

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

Constructor Detail

DateFeature

public DateFeature(Attribute[] attributes,
           DateFeature.Type[] types)

Constructor.

Parameters:

attributes - the variable attributes.

types - the types of features to be generated.

Method Detail

attributes

public Attribute[] attributes()

Description copied from interface: Feature

Returns the variable attributes of generated features. Note that these are NOT the original variable attributes of objects.

Specified by:

attributes in interface Feature<double[]>

Returns:

the variable attributes of generated features

f

public double f(double[] object,
       int id)

Description copied from interface: Feature

Generates a feature for given object.

Specified by:

f in interface Feature<double[]>

Parameters:

object - an object of interest.

id - the index of feature to be generated.

Returns:

a feature value.