polars max

Creates a max expression or aggregates columns to their max value.

warning This command requires a plugin The polars max command resides in the polars plugin. To use this command, you must install and register nu_plugin_polars. See the Plugins chapter in the book for more information.

Command Type

plugin

Signature

> polars max {flags}

Input/output types:

input	output
polars_expression	polars_expression
polars_selector	polars_expression
polars_dataframe	polars_dataframe
polars_lazyframe	polars_lazyframe

Examples

Max value from columns in a dataframe

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

Max aggregation for a group-by

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

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