net.fortytwo.flow.rdf.ranking
Class WeightedVector<T>

java.lang.Object
  net.fortytwo.flow.rdf.ranking.WeightedVector<T>

public class WeightedVector<T>
extends Object

Author:

Joshua Shinavier (http://fortytwo.net)

Field Summary

protected Map<T,WeightedValue<T>>

valueToWeightedValue

Constructor Summary

	WeightedVector()
protected	WeightedVector(Map<T,WeightedValue<T>> map)
	WeightedVector(WeightedVector<T> other)

Method Summary

WeightedVector<T>	add(WeightedVector<T> other)
void	addWeight(T v, double weight)
void	clear()
Handler<WeightedValue<T>,Exception>	createAddValueHandler()
Handler<WeightedValue<T>,Exception>	createSubtractValueHandler()
double	dotMultiplyBy(WeightedVector<T> other)
double	getMagnitude()
double	getWeight(T v)
Set<T>	keySet()
WeightedVector<T>	multiplyBy(double c)
WeightedVector<T>	multiplyByTransposeOf(WeightedVector<T> other)
void	normalize() Turns this vector into a unit vector (unless it is a zero vector).
void	normalizeAsDist() Note: assumes all non-negative weights.
WeightedVector<T>	normalized()
WeightedVector<T>	normalizedAsDist()
WeightedVector<T>	positiveClip() Removes each negative element from the vector.
void	setWeight(T v, double weight)
int	size()
WeightedVector<T>	subtract(WeightedVector<T> other)
WeightedValue<T>[]	toArray()
WeightedValue<T>[]	toSortedArray()
Collection<WeightedValue<T>>	values()

Methods inherited from class java.lang.Object

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

Field Detail

valueToWeightedValue

protected Map<T,WeightedValue<T>> valueToWeightedValue

Constructor Detail

WeightedVector

public WeightedVector()

WeightedVector

public WeightedVector(WeightedVector<T> other)

WeightedVector

protected WeightedVector(Map<T,WeightedValue<T>> map)

Method Detail

size

public int size()

keySet

public Set<T> keySet()

values

public Collection<WeightedValue<T>> values()

getWeight

public double getWeight(T v)

setWeight

public void setWeight(T v,
                      double weight)

addWeight

public void addWeight(T v,
                      double weight)

createAddValueHandler

public Handler<WeightedValue<T>,Exception> createAddValueHandler()

createSubtractValueHandler

public Handler<WeightedValue<T>,Exception> createSubtractValueHandler()

toArray

public WeightedValue<T>[] toArray()

Returns:

the vector as an unordered array of weighted values

toSortedArray

public WeightedValue<T>[] toSortedArray()

Returns:

the vector as an array of weighted values, sorted in order of decreasing weight

clear

public void clear()

getMagnitude

public double getMagnitude()

Returns:

magnitude of this vector

multiplyBy

public WeightedVector<T> multiplyBy(double c)

Parameters:

c -

Returns:

product of this vector with a constant value

add

public WeightedVector<T> add(WeightedVector<T> other)

Parameters:

other - another vector to add to this one

Returns:

sum of this vector with another vector (set union)

subtract

public WeightedVector<T> subtract(WeightedVector<T> other)

Parameters:

other - another vector to subtract from this one

Returns:

result of subtracting another vector from this vector (set exclusion)

dotMultiplyBy

public double dotMultiplyBy(WeightedVector<T> other)

Parameters:

other -

Returns:

dot product of this vector with another vector

multiplyByTransposeOf

public WeightedVector<T> multiplyByTransposeOf(WeightedVector<T> other)

Parameters:

other -

Returns:

product of this vector with the transpose of another vector (set intersection)

positiveClip

public WeightedVector<T> positiveClip()

Removes each negative element from the vector.

normalize

public void normalize()

Turns this vector into a unit vector (unless it is a zero vector).

normalized

public WeightedVector<T> normalized()

normalizeAsDist

public void normalizeAsDist()

Note: assumes all non-negative weights.

normalizedAsDist

public WeightedVector<T> normalizedAsDist()