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

Interface for classes that can keep track of a running average of a series of numbers. One can add to or remove from the series, as well as update a datum in the series. The class does not actually keep track of the series of values, just its running average, so it doesn't even matter if you remove/change a value that wasn't added.

public interface RunningAverage {

  

Parameters:
datum new item to add to the running average
Throws:
java.lang.IllegalArgumentException if datum is java.lang.Double.NaN
  void addDatum(double datum);

  

Parameters:
datum item to remove to the running average
Throws:
java.lang.IllegalArgumentException if datum is java.lang.Double.NaN
java.lang.IllegalStateException if count is 0
  void removeDatum(double datum);

  

Parameters:
delta amount by which to change a datum in the running average
Throws:
java.lang.IllegalArgumentException if delta is java.lang.Double.NaN
java.lang.IllegalStateException if count is 0
  void changeDatum(double delta);
  int getCount();
  double getAverage();
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