Function

Type Parameters:

I - the type of the input values

O - the type of the output values

All Known Subinterfaces:

Aggregate<I,O>, KeyFunction<I>, Predicate<I>, TimeFunction<I,O>, Transforms.CumulativeFunction<I,O>

All Known Implementing Classes:

Aggregation.Collapse, Aggregation.Count, Aggregation.Describe, Aggregation.Kurtosis, Aggregation.Max, Aggregation.Mean, Aggregation.Median, Aggregation.Min, Aggregation.Percentile, Aggregation.Product, Aggregation.Skew, Aggregation.StdDev, Aggregation.Sum, Aggregation.Unique, Aggregation.Variance, Selection.DropNaPredicate, TimeFunctions.DayOfWeek, TimeFunctions.HourOfDay, TimeFunctions.MonthOfYear, TimeFunctions.SeasonOfYear, Transforms.CumulativeMax, Transforms.CumulativeMin, Transforms.CumulativeProduct, Transforms.CumulativeSum, Views.FillNaFunction, WindowFunction
```
public interface Function<I,O>
```
A function that is applied to objects (rows or values) in a data frame.
Implementors define apply(Object) to perform the desired calculation and return the result.

See Also:

DataFrame#apply(Function), DataFrame#aggregate(Aggregate)

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  O apply(I value)
  Perform computation on the specified input value and return the result.

- Method Detail
  - apply
```
O apply(I value)
```
    Perform computation on the specified input value and return the result.
    
    Parameters:
    
    value - the input value
    
    Returns:
    
    the result