ExpMovingAverage (apache-cassandra API)

java.lang.Object
- org.apache.cassandra.utils.ExpMovingAverage

All Implemented Interfaces:

MovingAverage
```
public class ExpMovingAverage
extends java.lang.Object
implements MovingAverage
```
Sample-based exponential moving average. On every update a fraction of the current average is replaced by the new sample. New values have greater representation in the average, and older samples' effect exponentially decays with new data.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static ExpMovingAverage`	`decayBy10()`	Create a `ExpMovingAverage` where older values have less than 1% effect after 10 samples.
`static ExpMovingAverage`	`decayBy100()`	Create a `ExpMovingAverage` where older values have less than 1% effect after 100 samples.
`static MovingAverage`	`decayBy1000()`	Create a `ExpMovingAverage` where older values have less than 1% effect after 1000 samples.
`double`	`get()`
`java.lang.String`	`toString()`
`MovingAverage`	`update(double val)`
`static ExpMovingAverage`	`withDecay(double ratio, int samples)`	Create a `ExpMovingAverage` where older values have less effect than the given ratio after the given number of samples.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - decayBy1000
```
public static MovingAverage decayBy1000()
```
    Create a ExpMovingAverage where older values have less than 1% effect after 1000 samples.
  - decayBy100
```
public static ExpMovingAverage decayBy100()
```
    Create a ExpMovingAverage where older values have less than 1% effect after 100 samples.
  - decayBy10
```
public static ExpMovingAverage decayBy10()
```
    Create a ExpMovingAverage where older values have less than 1% effect after 10 samples.
  - withDecay
```
public static ExpMovingAverage withDecay(double ratio,
                                         int samples)
```
    Create a ExpMovingAverage where older values have less effect than the given ratio after the given number of samples.
  - update
```
public MovingAverage update(double val)
```
    Specified by:
    
    update in interface MovingAverage
  - get
```
public double get()
```
    Specified by:
    
    get in interface MovingAverage
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object