org.apache.mahout.cf.taste.impl.common

Class InvertedRunningAverageAndStdDev

java.lang.Object

org.apache.mahout.cf.taste.impl.common.InvertedRunningAverageAndStdDev

All Implemented Interfaces:

RunningAverage, RunningAverageAndStdDev

public final class InvertedRunningAverageAndStdDev
extends Object
implements RunningAverageAndStdDev

Constructor Summary

Constructors

Constructor and Description
InvertedRunningAverageAndStdDev(RunningAverageAndStdDev delegate)

Method Summary

Modifier and Type	Method and Description
void	addDatum(double datum)
void	changeDatum(double delta)
double	getAverage()
int	getCount()
double	getStandardDeviation()
RunningAverageAndStdDev	inverse()
void	removeDatum(double datum)

Methods inherited from class java.lang.Object

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

Constructor Detail

InvertedRunningAverageAndStdDev

public InvertedRunningAverageAndStdDev(RunningAverageAndStdDev delegate)

Method Detail

addDatum

public void addDatum(double datum)

Specified by:

addDatum in interface RunningAverage

Parameters:

datum - new item to add to the running average

removeDatum

public void removeDatum(double datum)

Specified by:

removeDatum in interface RunningAverage

Parameters:

datum - item to remove to the running average

changeDatum

public void changeDatum(double delta)

Specified by:

changeDatum in interface RunningAverage

Parameters:

delta - amount by which to change a datum in the running average

getCount

public int getCount()

Specified by:

getCount in interface RunningAverage

getAverage

public double getAverage()

Specified by:

getAverage in interface RunningAverage

getStandardDeviation

public double getStandardDeviation()

Specified by:

getStandardDeviation in interface RunningAverageAndStdDev

Returns:

standard deviation of data

inverse

public RunningAverageAndStdDev inverse()

Specified by:

inverse in interface RunningAverage

Specified by:

inverse in interface RunningAverageAndStdDev

Returns:

a (possibly immutable) object whose average is the negative of this object's