dfr max for expression

Creates a max expression or aggregates columns to their max value

Signature

> dfr max {flags}

Input/output types:

input	output
any	any

Examples

Max value from columns in a dataframe

> [[a b]; [6 2] [1 4] [4 1]] | dfr into-df | dfr max
╭───┬───┬───╮
│ # │ a │ b │
├───┼───┼───┤
│ 0 │ 6 │ 4 │
╰───┴───┴───╯

Max aggregation for a group-by

> [[a b]; [one 2] [one 4] [two 1]]
    | dfr into-df
    | dfr group-by a
    | dfr agg (dfr col b | dfr max)
╭───┬─────┬───╮
│ # │  a  │ b │
├───┼─────┼───┤
│ 0 │ one │ 4 │
│ 1 │ two │ 1 │
╰───┴─────┴───╯

Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag