com.yahoo.sketches.quantiles

Class UpdateDoublesSketch

java.lang.Object

com.yahoo.sketches.quantiles.DoublesSketch

com.yahoo.sketches.quantiles.UpdateDoublesSketch

public abstract class UpdateDoublesSketch
extends DoublesSketch

Author:

Jon Malkin

Field Summary

Fields inherited from class com.yahoo.sketches.quantiles.DoublesSketch

rand

Method Summary

Modifier and Type	Method and Description
CompactDoublesSketch	compact()
CompactDoublesSketch	compact(Memory dstMem) Returns a comapct version of this sketch.
static UpdateDoublesSketch	heapify(Memory srcMem)
abstract void	reset() Resets this sketch to the empty state, but retains the original value of k.
abstract void	update(double dataItem) Updates this sketch with the given double data item

Methods inherited from class com.yahoo.sketches.quantiles.DoublesSketch

builder, downSample, getCDF, getCompactStorageBytes, getCompactStorageBytes, getK, getMaxValue, getMinValue, getN, getNormalizedRankError, getNormalizedRankError, getPMF, getQuantile, getQuantiles, getQuantiles, getRetainedItems, getStorageBytes, getUpdatableStorageBytes, getUpdatableStorageBytes, isDirect, isEmpty, isEstimationMode, putMemory, putMemory, toByteArray, toByteArray, toString, toString, wrap

Methods inherited from class java.lang.Object

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

Method Detail

update

public abstract void update(double dataItem)

Updates this sketch with the given double data item

Parameters:

dataItem - an item from a stream of items. NaNs are ignored.

reset

public abstract void reset()

Resets this sketch to the empty state, but retains the original value of k.

heapify

public static UpdateDoublesSketch heapify(Memory srcMem)

compact

public CompactDoublesSketch compact()

compact

public CompactDoublesSketch compact(Memory dstMem)

Returns a comapct version of this sketch. If passing in a Memory object, the compact sketch will use that direct memory; otherwise, an on-heap sketch will be returned.

Parameters:

dstMem - An optional target memory to hold the sketch.

Returns:

A compact version of this sketch