polars last

Creates new dataframe with tail rows or creates a last expression.

warning This command requires a plugin The polars last 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 last {flags} (rows)

Parameters

rows: Number of rows for tail.

Input/output types:

input	output
polars_expression	polars_expression
polars_selector	polars_expression
polars_dataframe	polars_dataframe
polars_lazyframe	polars_lazyframe
polars_group_by	polars_lazyframe

Examples

Create new dataframe with last rows

> [[a b]; [1 2] [3 4]] | polars into-df | polars last 1
╭───┬───┬───╮
│ # │ a │ b │
├───┼───┼───┤
│ 0 │ 3 │ 4 │
╰───┴───┴───╯

Creates a last expression from a column

> polars col a | polars last

Aggregate the last values in the group.

> [[a b c d]; [1 0.5 true Apple] [2 0.5 true Orange] [2 4 true Apple] [3 10 false Apple] [4 13 false Banana] [5 14 true Banana]] | polars into-df -s {a: u8, b: f32, c: bool, d: str} | polars group-by d | polars last | polars sort-by [a] | polars collect
╭───┬────────┬───┬───────┬───────╮
│ # │   d    │ a │   b   │   c   │
├───┼────────┼───┼───────┼───────┤
│ 0 │ Orange │ 2 │  0.50 │ true  │
│ 1 │ Apple  │ 3 │ 10.00 │ false │
│ 2 │ Banana │ 5 │ 14.00 │ true  │
╰───┴────────┴───┴───────┴───────╯

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