Select all categorical columns

Description

Select all categorical columns

Usage

cs__categorical()

Value

A Polars selector

See Also

cs for the documentation on operators supported by Polars selectors.

Examples

library("polars")

df <- pl$DataFrame(
  foo = c("xx", "yy"),
  bar = c(123, 456),
  baz = c(2.0, 5.5),
  .schema_overrides = list(foo = pl$Categorical()),
)

# Select categorical columns:
df$select(cs$categorical())

#> shape: (2, 1)
#> ┌─────┐
#> │ foo │
#> │ --- │
#> │ cat │
#> ╞═════╡
#> │ xx  │
#> │ yy  │
#> └─────┘

# Select all columns except for those that are categorical:
df$select(!cs$categorical())

#> shape: (2, 2)
#> ┌───────┬─────┐
#> │ bar   ┆ baz │
#> │ ---   ┆ --- │
#> │ f64   ┆ f64 │
#> ╞═══════╪═════╡
#> │ 123.0 ┆ 2.0 │
#> │ 456.0 ┆ 5.5 │
#> └───────┴─────┘