expand

Create all combinations of values

Generates all unique combinations of the provided columns or expressions. Supports nesting() to only include combinations present in the data.

Parameters

• df (DataFrame): The DataFrame.

• … (Symbol | Vector | Call): Specification of columns to expand.

Returns

A DataFrame with all combinations.

Examples

expand(df, $type, $size)
expand(df, nesting($type, $size))
expand(df, $type, 2010:2012)