org.apache.crunch.lib

Class Average

java.lang.Object

org.apache.crunch.lib.Average

public class Average
extends Object

Constructor Summary

Constructors

Constructor and Description
Average()

Method Summary

Modifier and Type	Method and Description
static <K,V extends Number> PTable<K,Double>	meanValue(PTable<K,V> table) Calculate the mean average value by key for a table with numeric values.

Methods inherited from class java.lang.Object

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

Constructor Detail

Average

public Average()

Method Detail

meanValue

public static <K,V extends Number> PTable<K,Double> meanValue(PTable<K,V> table)

Calculate the mean average value by key for a table with numeric values.

Type Parameters:

K - Key type, can be any type

V - Value type, must be numeric (ie. extend java.lang.Number)

Parameters:

table - PTable of (key, value) pairs to operate on

Returns:

PTable<K, Double> of (key, mean(values)) pairs