Fill missing values in the series with the nearest available value (using the specified direction). Note that the series may still contain missing values after call to this function. This operation can only be used on ordered series. ## Parameters - `series` - An input series that is to be filled - `direction` - Specifies the direction used when searching for the nearest available value. `Backward` means that we want to look for the first value with a smaller key while `Forward` searches for the nearest greater key. ## Example let sample = Series.ofValues [ Double.NaN; 1.0; Double.NaN; 3.0 ] // Returns a series consisting of [1; 1; 3; 3] sample |> Series.fillMissing Direction.Backward // Returns a series consisting of [<missing>; 1; 1; 3] sample |> Series.fillMissing Direction.Forward [category:Missing values]

public static Series<K, T> FillMissing<K, T>(
	Direction direction,
	Series<K, T> series
)