dfr arg-max for dataframe

Return index for max value in series.

Signature

> dfr arg-max

Examples

Returns index for max value

> [1 3 2] | dfr into-df | dfr arg-max
╭───┬─────────╮
│ # │ arg_max │
├───┼─────────┤
│ 0 │       1 │
╰───┴─────────╯