org.apache.hadoop.hbase.io.hfile

Class RandomDistribution.Zipf

java.lang.Object

org.apache.hadoop.hbase.io.hfile.RandomDistribution.Zipf

All Implemented Interfaces:

RandomDistribution.DiscreteRNG

Enclosing class:

RandomDistribution

public static final class RandomDistribution.Zipf
extends java.lang.Object
implements RandomDistribution.DiscreteRNG

Zipf distribution. The ratio of the probabilities of integer i and j is defined as follows: P(i)/P(j)=((j-min+1)/(i-min+1))^sigma.

Constructor Summary

Constructors

Constructor and Description
Zipf(java.util.Random r, int min, int max, double sigma) Constructor
Zipf(java.util.Random r, int min, int max, double sigma, double epsilon) Constructor.

Method Summary

Modifier and Type	Method and Description
int	nextInt() Get the next random number

Methods inherited from class java.lang.Object

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

Constructor Detail

Zipf

public Zipf(java.util.Random r,
            int min,
            int max,
            double sigma)

Constructor

Parameters:

r - The random number generator.

min - minimum integer (inclusvie)

max - maximum integer (exclusive)

sigma - parameter sigma. (sigma > 1.0)

Zipf

public Zipf(java.util.Random r,
            int min,
            int max,
            double sigma,
            double epsilon)

Constructor.

Parameters:

r - The random number generator.

min - minimum integer (inclusvie)

max - maximum integer (exclusive)

sigma - parameter sigma. (sigma > 1.0)

epsilon - Allowable error percentage (0 < epsilon < 1.0).

Method Detail

nextInt

public int nextInt()

Description copied from interface: RandomDistribution.DiscreteRNG

Get the next random number

Specified by:

nextInt in interface RandomDistribution.DiscreteRNG

Returns:

the next random number.

See Also:

RandomDistribution.DiscreteRNG.nextInt()