CentralPivotingStrategy (Apache Commons Math (Legacy) 4.0-SNAPSHOT API)

java.lang.Object
- org.apache.commons.math4.legacy.stat.descriptive.rank.CentralPivotingStrategy

All Implemented Interfaces:

PivotingStrategy
```
public class CentralPivotingStrategy
extends Object
implements PivotingStrategy
```
A mid point strategy based on the average of begin and end indices.

Since:

3.4

Constructor Summary

Constructors
Constructor Description

CentralPivotingStrategy()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`pivotIndex(double[] work, int begin, int end)`	Find pivot index of the array so that partition and K^th element selection can be made.

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

- Constructor Detail
  - CentralPivotingStrategy
```
public CentralPivotingStrategy()
```
- Method Detail
  - pivotIndex
```
public int pivotIndex(double[] work,
                      int begin,
                      int end)
```
    Find pivot index of the array so that partition and K^th element selection can be made. This in particular picks a average of begin and end indices
    
    Specified by:
    
    pivotIndex in interface PivotingStrategy
    
    Parameters:
    
    work - data array
    
    begin - index of the first element of the slice
    
    end - index after the last element of the slice
    
    Returns:
    
    The index corresponding to a simple average of the first and the last element indices of the array slice
    
    Throws:
    
    MathIllegalArgumentException - MathIllegalArgumentException when indices exceeds range