org.apache.datasketches.quantilescommon

Class QuantilesFloatsAPI.FloatsPartitionBoundaries

java.lang.Object

org.apache.datasketches.quantilescommon.QuantilesFloatsAPI.FloatsPartitionBoundaries

Enclosing interface:

QuantilesFloatsAPI

public static class QuantilesFloatsAPI.FloatsPartitionBoundaries
extends Object

This encapsulates the essential information needed to construct actual partitions and is returned from the getPartitionBoundaries(int, QuantileSearchCritera) method.

Field Summary

Fields

Modifier and Type	Field and Description
float[]	boundaries The partition boundaries as quantiles.
long	N The total number of items presented to the sketch.
double[]	ranks The normalized ranks that correspond to the returned boundaries.

Constructor Summary

Constructors

Constructor and Description
FloatsPartitionBoundaries()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

N

public long N

The total number of items presented to the sketch.

To compute the weight or density of a specific partition i where i varies from 1 to m partitions:

 long N = getN();
 double[] ranks = getRanks();
 long weight = Math.round((ranks[i] - ranks[i - 1]) * N);
 

ranks

public double[] ranks

The normalized ranks that correspond to the returned boundaries. The returned array is of size (m + 1), where m is the requested number of partitions. Index 0 of the returned array is always 0.0, and index m is always 1.0.

boundaries

public float[] boundaries

The partition boundaries as quantiles. The returned array is of size (m + 1), where m is the requested number of partitions. Index 0 of the returned array is always getMinItem(), and index m is always getMaxItem().

Constructor Detail

FloatsPartitionBoundaries

public FloatsPartitionBoundaries()