dataframe

Counts unique values.

This command requires a plugin

The polars n-unique 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 n-unique {flags}

Input/output types:

input	output
any	any

Examples

Counts unique values

> [1 1 2 2 3 3 4] | polars into-df | polars n-unique
╭───┬──────────────╮
│ # │ count_unique │
├───┼──────────────┤
│ 0 │            4 │
╰───┴──────────────╯

Creates a is n-unique expression from a column

> polars col a | polars n-unique