smile.math.distance

Class SparseEuclideanDistance

java.lang.Object

smile.math.distance.SparseEuclideanDistance

All Implemented Interfaces:

Distance<SparseArray>, Metric<SparseArray>

public class SparseEuclideanDistance
extends Object
implements Metric<SparseArray>

Euclidean distance. Use getInstance() to get the standard unweighted Euclidean distance. Or create an instance with a specified weight vector. For float or double arrays, missing values (i.e. NaN) are also handled. Also support sparse arrays of which zeros are excluded to save space.

Author:

Haifeng Li

Constructor Summary

Constructors

Constructor and Description
SparseEuclideanDistance() Constructor.
SparseEuclideanDistance(double[] weight) Constructor with a given weight vector.

Method Summary

Methods

Modifier and Type	Method and Description
double	d(SparseArray x, SparseArray y) Returns the distance measure between two objects.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

SparseEuclideanDistance

public SparseEuclideanDistance()

Constructor. Standard (unweighted) Euclidean distance.

SparseEuclideanDistance

public SparseEuclideanDistance(double[] weight)

Constructor with a given weight vector.

Parameters:

weight - the weight vector.

Method Detail

toString

public String toString()

Overrides:

toString in class Object

d

public double d(SparseArray x,
       SparseArray y)

Description copied from interface: Distance

Returns the distance measure between two objects.

Specified by:

d in interface Distance<SparseArray>