CentralPivotingStrategy (Apache Commons Math 3.6.1 API)

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java.lang.Object
- org.apache.commons.math3.util.CentralPivotingStrategy

All Implemented Interfaces:

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

Since:

3.4

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description

CentralPivotingStrategy()

Method Summary

Methods
Modifier and Type	Method and 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)
               throws MathIllegalArgumentException
```
    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 PivotingStrategyInterface
    
    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 - when indices exceeds range

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