polars n-unique
for dataframe
Counts unique values.
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