som
Class FVector

java.lang.Object
  |
  +--som.FVector

public class FVector

extends java.lang.Object

A feature vector.

Author:

Antti Kerminen

Field Summary

protected double[]

vector Elements of the feature vector.

Constructor Summary

FVector(som.FVectorGroup group)
Construct a new feature vector in the given group.

FVector(int length)
Construct a new feature vector with the given length.

FVector(java.lang.String s)
Construct a new feature vector from a string representation.

FVector(java.lang.String s, int length)
Construct a new feature vector from a string representation with the length of the vector known.

Method Summary

void	add(som.FVector v) Add a vector to this vector.
double	difference(som.FVector v) Calculate an ad hoc difference measure.
int	dimension() Get the dimensionality of this vector.
double	distance(som.FVector v) Calculate the Euclidian distance to another vector.
double	dotProduct(som.FVector v) Calculate the dot product between this and another vector.
double	getValue(int index) Get the value of an element.
double	length() Calculate the geometric length of this vector.
static void	main(java.lang.String[] args) A test driver.
void	normalize() Normalize the length of the vector to 1.
void	setAll() Set all values to 1.
void	setUnit(int feature) Set vector as unit vector.
void	setValue(int index, double value) Set the value of an element.
java.lang.String	toString() Return the string representation of this object.

Methods inherited from class java.lang.Object

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

Field Detail

vector

protected double[] vector

Elements of the feature vector.

Constructor Detail

FVector

public FVector(java.lang.String s)

Construct a new feature vector from a string representation.

FVector

public FVector(java.lang.String s,
               int length)

Construct a new feature vector from a string representation with the length of the vector known.

FVector

public FVector(int length)

Construct a new feature vector with the given length.

FVector

public FVector(som.FVectorGroup group)

Construct a new feature vector in the given group.

Method Detail

setUnit

public void setUnit(int feature)

Set vector as unit vector.

Parameters:

feature - the index of the feature to be set.

setAll

public void setAll()

Set all values to 1.

setValue

public void setValue(int index,
                     double value)

Set the value of an element.

Parameters:

index - the index of the element.

value - the value of the element.

getValue

public double getValue(int index)

Get the value of an element.

Parameters:

index - the index of the element.

Returns:

the value of the element.

add

public void add(som.FVector v)

Add a vector to this vector.

distance

public double distance(som.FVector v)

Calculate the Euclidian distance to another vector.

dotProduct

public double dotProduct(som.FVector v)

Calculate the dot product between this and another vector.

difference

public double difference(som.FVector v)

Calculate an ad hoc difference measure.

normalize

public void normalize()

Normalize the length of the vector to 1.

length

public double length()

Calculate the geometric length of this vector.

dimension

public int dimension()

Get the dimensionality of this vector. That is the number of elements.

toString

public java.lang.String toString()

Return the string representation of this object.

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)

A test driver.