Select all temporal columns

Description

Select all temporal columns

Usage

cs__temporal()

Value

A Polars selector

See Also

cs for the documentation on operators supported by Polars selectors.

Examples

library("polars")

df <- pl$DataFrame(
  dtm = as.POSIXct(c("2001-5-7 10:25", "2031-12-31 00:30")),
  dt = as.Date(c("1999-12-31", "2024-8-9")),
  value = 1:2
)

# Match all temporal columns:
df$select(cs$temporal())

#> shape: (2, 2)
#> ┌─────────────────────┬────────────┐
#> │ dtm                 ┆ dt         │
#> │ ---                 ┆ ---        │
#> │ datetime[ms]        ┆ date       │
#> ╞═════════════════════╪════════════╡
#> │ 2001-05-07 10:25:00 ┆ 1999-12-31 │
#> │ 2031-12-31 00:30:00 ┆ 2024-08-09 │
#> └─────────────────────┴────────────┘

# Match all temporal columns except for time columns:
df$select(cs$temporal() - cs$datetime())

#> shape: (2, 1)
#> ┌────────────┐
#> │ dt         │
#> │ ---        │
#> │ date       │
#> ╞════════════╡
#> │ 1999-12-31 │
#> │ 2024-08-09 │
#> └────────────┘

# Match all columns except for temporal columns:
df$select(!cs$temporal())

#> shape: (2, 1)
#> ┌───────┐
#> │ value │
#> │ ---   │
#> │ i32   │
#> ╞═══════╡
#> │ 1     │
#> │ 2     │
#> └───────┘