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Find the variance in an array

Source code

Description

Find the variance in an array

Usage

<Expr>$arr$var(ddof = 1)

Arguments

ddof Delta Degrees of Freedom: the divisor used in the calculation is N - ddof, where N represents the number of elements. By default ddof is 1.

Value

Expr

Examples

library("polars")

df = pl$DataFrame(
  values = list(c(2, 1, 4), c(8.4, 3.2, 1)),
  schema = list(values = pl$Array(pl$Float64, 3))
)
df$with_columns(var = pl$col("values")$arr$var())
#> shape: (2, 2)
#> ┌─────────────────┬──────────┐
#> │ values          ┆ var      │
#> │ ---             ┆ ---      │
#> │ array[f64, 3]   ┆ f64      │
#> ╞═════════════════╪══════════╡
#> │ [2.0, 1.0, 4.0] ┆ 2.333333 │
#> │ [8.4, 3.2, 1.0] ┆ 14.44    │
#> └─────────────────┴──────────┘