Find the maximum value in an array

Source code

Description

Find the maximum value in an array

Usage

<Expr>$arr$max()

Details

This method is only available with the "nightly" feature. See polars_info() for more details.

Value

Expr

Examples

library("polars")

df = pl$DataFrame(
  values = list(c(1, 2), c(3, 4), c(NA_real_, NA_real_)),
  schema = list(values = pl$Array(pl$Float64, 2))
)
df$with_columns(max = pl$col("values")$arr$max())

#> shape: (3, 2)
#> ┌───────────────┬──────┐
#> │ values        ┆ max  │
#> │ ---           ┆ ---  │
#> │ array[f64, 2] ┆ f64  │
#> ╞═══════════════╪══════╡
#> │ [1.0, 2.0]    ┆ 2.0  │
#> │ [3.0, 4.0]    ┆ 4.0  │
#> │ [null, null]  ┆ null │
#> └───────────────┴──────┘