org.conqat.lib.commons.datamining

Class SparseVector

java.lang.Object

org.conqat.lib.commons.datamining.SparseVector

public class SparseVector
extends java.lang.Object

A sparse vector in the n-dimensional space of a numerical type T. Basically a mapping from component (represented as an Integer) to a double value. Unset components correspond to 0, i.e. a newly created instance represents the 0-vector.

Constructor Summary

Constructors

Constructor and Description
SparseVector()

Method Summary

Modifier and Type	Method and Description
double	cosineSimilarity(SparseVector other) Computes the cosine distance between this and the given vector.
void	set(int key, double value) Sets the given value under the given key, value must not be null

Methods inherited from class java.lang.Object

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

Constructor Detail

SparseVector

public SparseVector()

Method Detail

set

public void set(int key,
                double value)

Sets the given value under the given key, value must not be null

cosineSimilarity

public double cosineSimilarity(SparseVector other)

Computes the cosine distance between this and the given vector. See also http://en.wikipedia.org/wiki/Cosine_similarity