Contents

aggregated(on:into:transform:)

Generates a data frame with a column for the group identifier and a column of values from the transform.

Declaration

func aggregated<Element, Result>(on columnID: ColumnID<Element>, into aggregatedColumnName: String? = nil, transform: (DiscontiguousColumnSlice<Element>) throws -> Result) rethrows -> DataFrame

Parameters

  • columnID:

    A column identifier.

  • aggregatedColumnName:

    The name of the aggregation column the method adds to the data frame.

  • transform:

    A closure that transforms each group’s elements in the column.

See Also

Aggregating a Row Grouping