Map a function to a single column within tibble groups

A convenience function for mapping a function -- which accepts a vector as input and outputs an atomic value -- to a single column of a dataframe. If the dataframe is grouped, the function will be applied within each group.

map_groups(x, col, f, ...)

Arguments

x	A tibble
col	Column to pass as a vector to f.
f	Function to be mapped to col.
...	Additional arguments to f.

Value

A dataframe with the original grouped columns (if x had originally been grouped) and a data column containing the output of the mapped function f.