EarthMoversDistance (Apache Commons Math 3.6.1 API)

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java.lang.Object
- org.apache.commons.math3.ml.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.

Since:

3.3

See Also:
Earth Mover's distance (Wikipedia), Serialized Form

- Constructor Summary
  
  Constructors
  Constructor and Description
  
  EarthMoversDistance()
- Method Summary
  
  Methods
  Modifier and Type Method and 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)
               throws DimensionMismatchException
```
    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:
    
    DimensionMismatchException - if the array lengths differ.

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