SampleStat (Hadoop 1.2.2-SNAPSHOT API)

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java.lang.Object
- org.apache.hadoop.metrics2.util.SampleStat

```
public class SampleStat
extends Object
```
Helper to compute running sample stats

嵌套类概要

嵌套类
限定符和类型类和说明

static class SampleStat.MinMax
Helper to keep running min/max

构造器概要

构造器
构造器和说明

SampleStat()
Construct a new running sample stat

方法概要

方法
限定符和类型	方法和说明
`SampleStat`	`add(double x)` Add a sample the running stat.
`SampleStat`	`add(long nSamples, double x)` Add some sample and a partial sum to the running stat.
`void`	`copyTo(SampleStat other)` Copy the values to other (saves object creation and gc.)
`double`	`max()`
`double`	`mean()`
`double`	`min()`
`long`	`numSamples()`
`void`	`reset()`
`double`	`stddev()`
`double`	`variance()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - SampleStat
```
public SampleStat()
```
    Construct a new running sample stat
- 方法详细资料
  - reset
```
public void reset()
```
  - copyTo
```
public void copyTo(SampleStat other)
```
    Copy the values to other (saves object creation and gc.)
    
    参数:
    other - the destination to hold our values
  - add
```
public SampleStat add(double x)
```
    Add a sample the running stat.
    
    参数:
    x - the sample number
    
    返回:
    self
  - add
```
public SampleStat add(long nSamples,
             double x)
```
    Add some sample and a partial sum to the running stat. Note, min/max is not evaluated using this method.
    
    参数:
    nSamples - number of samples
    x - the partial sum
    
    返回:
    self
  - numSamples
```
public long numSamples()
```
    返回:
    the total number of samples
  - mean
```
public double mean()
```
    返回:
    the arithmetic mean of the samples
  - variance
```
public double variance()
```
    返回:
    the variance of the samples
  - stddev
```
public double stddev()
```
    返回:
    the standard deviation of the samples
  - min
```
public double min()
```
    返回:
    the minimum value of the samples
  - max
```
public double max()
```
    返回:
    the maximum value of the samples

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详细资料:
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