GroupBy Mean

Source code

Description

Reduce the groups to the mean value.

Usage

<GroupBy>$mean()

Value

aggregated DataFrame

Examples

library("polars")

df = pl$DataFrame(
  a = c(1, 2, 2, 3, 4, 5),
  b = c(0.5, 0.5, 4, 10, 13, 14),
  c = c(TRUE, TRUE, TRUE, FALSE, FALSE, TRUE),
  d = c("Apple", "Orange", "Apple", "Apple", "Banana", "Banana")
)
df$group_by("d", maintain_order = TRUE)$mean()

#> shape: (3, 4)
#> ┌────────┬─────┬──────────┬──────────┐
#> │ d      ┆ a   ┆ b        ┆ c        │
#> │ ---    ┆ --- ┆ ---      ┆ ---      │
#> │ str    ┆ f64 ┆ f64      ┆ f64      │
#> ╞════════╪═════╪══════════╪══════════╡
#> │ Apple  ┆ 2.0 ┆ 4.833333 ┆ 0.666667 │
#> │ Orange ┆ 2.0 ┆ 0.5      ┆ 1.0      │
#> │ Banana ┆ 4.5 ┆ 13.5     ┆ 0.5      │
#> └────────┴─────┴──────────┴──────────┘