Value counts

Description

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

Usage

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

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 field a specific name, defaults to `“count”`.

Value

Expr

Examples

library(polars)

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

#> shape: (3, 1)
#> ┌───────────────────┐
#> │ Species           │
#> │ ---               │
#> │ struct[2]         │
#> ╞═══════════════════╡
#> │ {"virginica",50}  │
#> │ {"versicolor",50} │
#> │ {"setosa",50}     │
#> └───────────────────┘

df$unnest()$to_data_frame()

#>      Species count
#> 1  virginica    50
#> 2 versicolor    50
#> 3     setosa    50