smile.feature

Class DateFeature

java.lang.Object

smile.feature.DateFeature

All Implemented Interfaces:

Feature<double[]>

public class DateFeature
extends java.lang.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.

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(smile.data.Attribute[] attributes, DateFeature.Type[] types) Constructor.

Method Summary

Modifier and Type	Method and Description
smile.data.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(smile.data.Attribute[] attributes,
                   DateFeature.Type[] types)

Constructor.

Parameters:

attributes - the variable attributes.

types - the types of features to be generated.

Method Detail

attributes

public smile.data.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.