Compute the variance of the sub-arrays
Description
Compute the variance of the sub-arrays
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
A polars expression
Examples
library("polars")
df <- pl$DataFrame(
values = list(c(2, 1, 4), c(8.4, 3.2, 1)),
)$cast(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 │
#> └─────────────────┴──────────┘