polars std for dataframe
Creates a std expression for an aggregation of std value from columns in a dataframe.
Signature
> polars std {flags}
Input/output types:
| input | output |
|---|---|
| polars_expression | polars_expression |
| polars_dataframe | polars_dataframe |
| polars_lazyframe | polars_lazyframe |
Examples
Std value from columns in a dataframe
> [[a b]; [6 2] [4 2] [2 2]] | polars into-df | polars std | polars collect ╭───┬──────┬──────╮ │ # │ a │ b │ ├───┼──────┼──────┤ │ 0 │ 2.00 │ 0.00 │ ╰───┴──────┴──────╯
Std aggregation for a group-by
> [[a b]; [one 2] [one 2] [two 1] [two 1]]
| polars into-df
| polars group-by a
| polars agg (polars col b | polars std)
| polars collect
| polars sort-by a
╭───┬─────┬──────╮
│ # │ a │ b │
├───┼─────┼──────┤
│ 0 │ one │ 0.00 │
│ 1 │ two │ 0.00 │
╰───┴─────┴──────╯
Copyright © 2019–2026 The Nushell Project DevelopersLicensed under the MIT License.
https://www.nushell.sh/commands/docs/polars_std.html
