EarthMoversDistance (Apache Commons Math (Legacy) 4.0-SNAPSHOT API)

java.lang.Object
- org.apache.commons.math4.legacy.ml.distance.EarthMoversDistance

All Implemented Interfaces:

DistanceMeasure
```
public class EarthMoversDistance
extends Object
implements DistanceMeasure
```
Calculates the Earh Mover's distance (also known as Wasserstein metric) between two distributions.

Since:

3.3

See Also:

Earth Mover's distance (Wikipedia)

Constructor Summary

Constructors
Constructor Description

EarthMoversDistance()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`compute(double[] a, double[] b)`	Compute the distance between two n-dimensional vectors.

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

- Constructor Detail
  - EarthMoversDistance
```
public EarthMoversDistance()
```
- Method Detail
  - compute
```
public double compute(double[] a,
                      double[] b)
```
    Compute the distance between two n-dimensional vectors.
    The two vectors are required to have the same dimension.
    
    Specified by:
    
    compute in interface DistanceMeasure
    
    Parameters:
    
    a - the first vector
    
    b - the second vector
    
    Returns:
    
    the distance between the two vectors