databionics.esom.neighborhood
Class EpanechicovNeighborhood

java.lang.Object
  databionics.esom.neighborhood.Neighborhood
      databionics.esom.neighborhood.CachedNeighborhood
          databionics.esom.neighborhood.EpanechicovNeighborhood

public class EpanechicovNeighborhood
extends CachedNeighborhood

Epanechicovian neighborhood kernel

Field Summary

protected static org.apache.log4j.Logger	log interface to log4j system
protected int	norm normalization factor

Fields inherited from class databionics.esom.neighborhood.CachedNeighborhood

weights

Fields inherited from class databionics.esom.neighborhood.Neighborhood

radius, scaling

Constructor Summary

EpanechicovNeighborhood()
Create a new neighborhood object

EpanechicovNeighborhood(int radius, double scaling)
Create a new neighborhood object

Method Summary

protected double	calculate(int distance) Calculate the weight value for this distance.
void	init() Initialize constants and the cache

Methods inherited from class databionics.esom.neighborhood.CachedNeighborhood

get

Methods inherited from class databionics.esom.neighborhood.Neighborhood

setRadius, setScaling

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.apache.log4j.Logger log

interface to log4j system

norm

protected int norm

normalization factor

Constructor Detail

EpanechicovNeighborhood

public EpanechicovNeighborhood()

Create a new neighborhood object

EpanechicovNeighborhood

public EpanechicovNeighborhood(int radius,
                               double scaling)

Create a new neighborhood object

Parameters:

radius - radius of kernel

scaling - scaling factor for all weights

Method Detail

init

public void init()

Initialize constants and the cache

Overrides:

init in class CachedNeighborhood

Parameters:

offset -

calculate

protected double calculate(int distance)

Calculate the weight value for this distance. Weights are calculated with the Epanechicov function.

Specified by:

calculate in class Neighborhood

Parameters:

distance - distance from center ([0..radius])

Returns:

weight value for this distance