org.android.activityminer.logic.features.calculators
Class VarianceCalculator<T extends Enum<T> & Dimensions>

java.lang.Object
  org.android.activityminer.logic.features.calculators.AbstractCalculator<T,U>
      org.android.activityminer.logic.features.calculators.AbstractCompositeCalculator<T,Double>
          org.android.activityminer.logic.features.calculators.VarianceCalculator<T>

Type Parameters:

T - the enumeration type for the dimensions

All Implemented Interfaces:

Calculator<Double>, CompositeCalculator<Double>

public final class VarianceCalculator<T extends Enum<T> & Dimensions>
extends AbstractCompositeCalculator<T,Double>

Implementation of a calculator for the variance in the values of a dimension.

Field Summary

private double[]	diffs2Mean The value cache for the difference of single values from mean.
private MeanCalculator<T>	meanCalculator The calculator providing the mean value.
private DimensionValueCache<T>	valueCache The value cache.

Fields inherited from class org.android.activityminer.logic.features.calculators.AbstractCalculator

dimension, value

Constructor Summary

VarianceCalculator(DimensionValueCache<T> valueCache, MeanCalculator<T> meanCalculator)
Constructor

Method Summary

Double	getCompositeValue() Does calculate the composite value.
double[]	getDiffs2Mean() Getter for the value differences to the mean of all values
Double	getInitialValue() Method for value initialization.
MeanCalculator<T>	getMeanCalculator() Getter for the mean calculator.
DimensionValueCache<T>	getValueCache() Getter for the value cache calculator.

Methods inherited from class org.android.activityminer.logic.features.calculators.AbstractCompositeCalculator

getValue, reset

Methods inherited from class org.android.activityminer.logic.features.calculators.AbstractCalculator

getDimension

Methods inherited from class java.lang.Object

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

Field Detail

valueCache

private final DimensionValueCache<T extends Enum<T> & Dimensions> valueCache

The value cache.

diffs2Mean

private double[] diffs2Mean

The value cache for the difference of single values from mean.

meanCalculator

private final MeanCalculator<T extends Enum<T> & Dimensions> meanCalculator

The calculator providing the mean value.

Constructor Detail

VarianceCalculator

public VarianceCalculator(DimensionValueCache<T> valueCache,
                          MeanCalculator<T> meanCalculator)

Constructor

Parameters:

valueCache - the value cache

meanCalculator - the mean calculator

Method Detail

getInitialValue

public final Double getInitialValue()

Description copied from interface: Calculator

Method for value initialization.

Returns:

the initialized value

getCompositeValue

public Double getCompositeValue()

Description copied from interface: CompositeCalculator

Does calculate the composite value.

Returns:

the composite value

getDiffs2Mean

public double[] getDiffs2Mean()

Getter for the value differences to the mean of all values

Returns:

the value differences to the mean

getMeanCalculator

public MeanCalculator<T> getMeanCalculator()

Getter for the mean calculator.

Returns:

the mean calculator

getValueCache

public DimensionValueCache<T> getValueCache()

Getter for the value cache calculator.

Returns:

the value cache