polars sum
for expression
Creates a sum expression for an aggregation or aggregates columns to their sum value.
This command requires a plugin
The polars sum
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 sum {flags}
Input/output types:
input | output |
---|---|
any | any |
Examples
Sums all columns in a dataframe
> [[a b]; [6 2] [1 4] [4 1]] | polars into-df | polars sum
╭───┬────┬───╮
│ # │ a │ b │
├───┼────┼───┤
│ 0 │ 11 │ 7 │
╰───┴────┴───╯
Sum 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 sum)
╭───┬─────┬───╮
│ # │ a │ b │
├───┼─────┼───┤
│ 0 │ one │ 6 │
│ 1 │ two │ 1 │
╰───┴─────┴───╯