Find the standard deviation in an array
Description
Find the standard deviation in an array
Usage
<Expr>$arr$std(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(std = pl$col("values")$arr$std())
#> shape: (2, 2)
#> ┌─────────────────┬──────────┐
#> │ values ┆ std │
#> │ --- ┆ --- │
#> │ array[f64, 3] ┆ f64 │
#> ╞═════════════════╪══════════╡
#> │ [2.0, 1.0, 4.0] ┆ 1.527525 │
#> │ [8.4, 3.2, 1.0] ┆ 3.8 │
#> └─────────────────┴──────────┘