Select columns that end with the given substring(s)

Description

Select columns that end with the given substring(s)

Usage

cs__ends_with(...)

Arguments

…	\<dynamic-dots\> Substring(s) that matching column names should end with.

Value

A Polars selector

See Also

cs for the documentation on operators supported by Polars selectors.

Examples

library("polars")

df <- pl$DataFrame(
  foo = c("x", "y"),
  bar = c(123, 456),
  baz = c(2.0, 5.5),
  zap = c(FALSE, TRUE)
)

# Select columns that end with the substring "z":
df$select(cs$ends_with("z"))

#> shape: (2, 1)
#> ┌─────┐
#> │ baz │
#> │ --- │
#> │ f64 │
#> ╞═════╡
#> │ 2.0 │
#> │ 5.5 │
#> └─────┘

# Select columns that end with either the letter "z" or "r":
df$select(cs$ends_with("z", "r"))

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

# Select all columns except for those that end with the substring "z":
df$select(!cs$ends_with("z"))

#> shape: (2, 3)
#> ┌─────┬───────┬───────┐
#> │ foo ┆ bar   ┆ zap   │
#> │ --- ┆ ---   ┆ ---   │
#> │ str ┆ f64   ┆ bool  │
#> ╞═════╪═══════╪═══════╡
#> │ x   ┆ 123.0 ┆ false │
#> │ y   ┆ 456.0 ┆ true  │
#> └─────┴───────┴───────┘