EarthMoversDistance (Hipparchus 3.0 API)

java.lang.Object
- org.hipparchus.clustering.distance.EarthMoversDistance

All Implemented Interfaces:

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

See Also:

Earth Mover's distance (Wikipedia), Serialized Form

Constructor Summary

Constructors
Constructor Description

EarthMoversDistance()
Empty constructor.

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()
```
    Empty constructor.
    This constructor is not strictly necessary, but it prevents spurious javadoc warnings with JDK 18 and later.
    
    Since:
    
    3.0
- Method Detail
  - compute
```
public double compute(double[] a,
                      double[] b)
               throws MathIllegalArgumentException
```
    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
    
    Throws:
    
    MathIllegalArgumentException - if the array lengths differ.