Value counts

Description

Count all unique values and create a struct mapping value to count.

Usage

<Expr>$value_counts(..., sort = FALSE, parallel = FALSE, name, normalize = FALSE)

Arguments

`…`	Ignored.
`sort`	Ensure the output is sorted from most values to least.
`parallel`	Better to turn this off in the aggregation context, as it can lead to contention.
`name`	Give the resulting count column a specific name. The default is `“count”` if `normalize = FALSE` and `“proportion”` if `normalize = TRUE`.
`normalize`	If `TRUE`, it gives relative frequencies of the unique values instead of their count.

Value

Expr

Examples

library("polars")

df = as_polars_df(iris)
df$select(pl$col("Species")$value_counts())$unnest()

#> shape: (3, 2)
#> ┌────────────┬───────┐
#> │ Species    ┆ count │
#> │ ---        ┆ ---   │
#> │ cat        ┆ u32   │
#> ╞════════════╪═══════╡
#> │ setosa     ┆ 50    │
#> │ virginica  ┆ 50    │
#> │ versicolor ┆ 50    │
#> └────────────┴───────┘

df$select(pl$col("Species")$value_counts(normalize = TRUE))$unnest()

#> shape: (3, 2)
#> ┌────────────┬────────────┐
#> │ Species    ┆ proportion │
#> │ ---        ┆ ---        │
#> │ cat        ┆ f64        │
#> ╞════════════╪════════════╡
#> │ virginica  ┆ 0.333333   │
#> │ versicolor ┆ 0.333333   │
#> │ setosa     ┆ 0.333333   │
#> └────────────┴────────────┘