FieldIndex (PDI Engine 9.3.0.0-424 API)

java.lang.Object
- org.pentaho.di.trans.steps.univariatestats.FieldIndex

```
public class FieldIndex
extends Object
```
Class used to hold operating field index, intermediate data and final results for a stats calculation. Has functions to compute the mean, standard deviation and arbitrary percentiles. Percentiles can be computed using interpolation or a simple method. See The Engineering Statistics Handbook for details.

Field Summary

Fields
Modifier and Type	Field	Description
`double`	`m_arbitraryPercentile`
`int`	`m_columnIndex`
`double`	`m_count`
`double`	`m_max`
`double`	`m_mean`
`double`	`m_median`
`double`	`m_min`
`double`	`m_stdDev`
`double`	`m_sum`
`double`	`m_sumSq`

Constructor Summary

Constructors
Constructor Description

FieldIndex()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`calculateDerived()`
`Object[]`	`generateOutputValues(UnivariateStatsMetaFunction usmf, ArrayList<Number> cache)`	Constructs an array of Objects containing the requested statistics for one univariate stats meta function using this `FieldIndex`.

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

- Field Detail
  - m_columnIndex
```
public int m_columnIndex
```
  - m_count
```
public double m_count
```
  - m_mean
```
public double m_mean
```
  - m_stdDev
```
public double m_stdDev
```
  - m_max
```
public double m_max
```
  - m_min
```
public double m_min
```
  - m_median
```
public double m_median
```
  - m_arbitraryPercentile
```
public double m_arbitraryPercentile
```
  - m_sum
```
public double m_sum
```
  - m_sumSq
```
public double m_sumSq
```
- Constructor Detail
  - FieldIndex
```
public FieldIndex()
```
- Method Detail
  - calculateDerived
```
public void calculateDerived()
```
  - generateOutputValues
```
public Object[] generateOutputValues(UnivariateStatsMetaFunction usmf,
                                     ArrayList<Number> cache)
```
    Constructs an array of Objects containing the requested statistics for one univariate stats meta function using this FieldIndex.
    
    Parameters:
    
    usmf - theUnivariateStatsMetaFunction to compute stats for. This contains the input field selected by the user along with which stats to compute for it.
    
    Returns:
    
    an array of computed statistics