org.apache.mahout.cf.taste.impl.common
Class WeightedRunningAverage
java.lang.Object
org.apache.mahout.cf.taste.impl.common.WeightedRunningAverage
- All Implemented Interfaces:
- Serializable, RunningAverage
- Direct Known Subclasses:
- WeightedRunningAverageAndStdDev
public class WeightedRunningAverage
- extends Object
- implements RunningAverage, Serializable
- See Also:
- Serialized Form
WeightedRunningAverage
public WeightedRunningAverage()
addDatum
public void addDatum(double datum)
- Specified by:
addDatum
in interface RunningAverage
- Parameters:
datum
- new item to add to the running average
addDatum
public void addDatum(double datum,
double weight)
removeDatum
public void removeDatum(double datum)
- Specified by:
removeDatum
in interface RunningAverage
- Parameters:
datum
- item to remove to the running average
removeDatum
public void removeDatum(double datum,
double weight)
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
changeDatum
public void changeDatum(double delta,
double weight)
getTotalWeight
public double getTotalWeight()
getCount
public int getCount()
- Specified by:
getCount
in interface RunningAverage
- Returns:
getTotalWeight()
getAverage
public double getAverage()
- Specified by:
getAverage
in interface RunningAverage
inverse
public RunningAverage inverse()
- Specified by:
inverse
in interface RunningAverage
- Returns:
- a (possibly immutable) object whose average is the negative of this object's
toString
public String toString()
- Overrides:
toString
in class Object
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