Value counts

Description

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

Usage

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

Arguments

`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.

Value

Expr

Examples

library(polars)

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

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

df$unnest()$to_data_frame() # recommended to unnest structs before converting to R

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