DynamicTimeWarping

java.lang.Object
- org.palladiosimulator.edp2.distancemetrics.DynamicTimeWarping

All Implemented Interfaces:

DistanceMetric
```
public class DynamicTimeWarping
extends Object
implements DistanceMetric
```
This algorithm calculates the distance with the Dynamic Time Warping principle. This implementation is based on the pseudo code of the windowed variant of the following wikipedia article: https://en.wikipedia.org/wiki/Dynamic_time_warping Note: This class doesn't use the TupleWrapper class from the Utility package because it doesn't need the time values and it would so cause an overhead. Besides that an array with infinity values needs to be initialized which would make it neccessary to create TupleMeasurements initialized to infinity but with unknown time values.

Constructor Summary

Constructors
Constructor Description

DynamicTimeWarping()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.jscience.physics.amount.Amount<?>`	`calculateDistance(IDataStream<org.palladiosimulator.measurementframework.TupleMeasurement> s1, IDataStream<org.palladiosimulator.measurementframework.TupleMeasurement> s2)`	This method contains the distance metric algorithm.
`void`	`setWindow(int window)`	Sets the window size which is the search space the DTW algorithm should look for shortest distance.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DynamicTimeWarping
```
public DynamicTimeWarping()
```
- Method Detail
  - calculateDistance
```
public org.jscience.physics.amount.Amount<?> calculateDistance(IDataStream<org.palladiosimulator.measurementframework.TupleMeasurement> s1,
                                                               IDataStream<org.palladiosimulator.measurementframework.TupleMeasurement> s2)
```
    Description copied from interface: DistanceMetric
    
    This method contains the distance metric algorithm.
    
    Specified by:
    
    calculateDistance in interface DistanceMetric
    
    Parameters:
    
    s1 - First stream of measurement to compare.
    
    s2 - Second stream of measurement to compare.
    
    Returns:
    
    Return a generic Amount which can contain any Quantity. Returns null, if calcuation couldn't be executed.
  - setWindow
```
public void setWindow(int window)
```
    Sets the window size which is the search space the DTW algorithm should look for shortest distance.
    
    Parameters:
    
    window - The size of the window.