expression

Creates a sum expression for an aggregation or aggregates columns to their sum value.

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 │
╰───┴─────┴───╯