ai.libs.jaicore.ml.tsc.filter.transform

Class CosineTransform

java.lang.Object

ai.libs.jaicore.ml.tsc.filter.transform.ATransformFilter

ai.libs.jaicore.ml.tsc.filter.transform.CosineTransform

All Implemented Interfaces:

IFilter

public class CosineTransform
extends ATransformFilter

Calculates the cosine transform of a time series. For this implementation, the definition as given in "Non-isometric transforms in time series classification using DTW" by Tomasz Gorecki and Maciej Luczak (2014) is used. The cosine transform f = {f(k): k = 1 to n} of a time series T = {T(i): i = 1 to n } is defined as f(k) = sum_{i=1}^{n} T(i) * cos[(PI/n)*(i-0.5)*(k-1)].

Constructor Summary

Constructors

Constructor and Description
CosineTransform()

Method Summary

Modifier and Type	Method and Description
double[]	transform(double[] input) This function transforms only a single instance.

Methods inherited from class ai.libs.jaicore.ml.tsc.filter.transform.ATransformFilter

fit, fit, fit, fitTransform, fitTransform, fitTransform, transform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

CosineTransform

public CosineTransform()

Method Detail

transform

public double[] transform(double[] input)

Description copied from interface: IFilter

This function transforms only a single instance.

Parameters:

input - the to transform instance

Returns:

the transformed instance