dfr arg-where for expression

Creates an expression that returns the arguments where expression is true.

Signature

> dfr arg-where

Examples

Return a dataframe where the value match the expression

> let df = ([[a b]; [one 1] [two 2] [three 3]] | dfr into-df);
    $df | dfr select (dfr arg-where ((dfr col b) >= 2) | dfr as b_arg)
╭───┬───────╮
│ # │ b_arg │
├───┼───────┤
│ 0 │     1 │
│ 1 │     2 │
╰───┴───────╯