dataframe

Show only the first number of rows or create a first expression

This command requires a plugin

The polars first 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.

Signature

> polars first {flags} (rows)

Parameters

• rows: starting from the front, the number of rows to return

Input/output types:

input	output
any	any

Examples

Return the first row of a dataframe

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

Return the first two rows of a dataframe

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

Creates a first expression from a column

> polars col a | polars first