Fill null values using interpolation

Description

Usage

<Expr>$interpolate(method = c("linear", "nearest"))

Arguments

method Interpolation method. Must be one of “linear” or “nearest”.

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(a = c(1, NA, 3), b = c(1, NaN, 3))
df$with_columns(
  a_interpolated = pl$col("a")$interpolate(),
  b_interpolated = pl$col("b")$interpolate()
)

#> shape: (3, 4)
#> ┌──────┬─────┬────────────────┬────────────────┐
#> │ a    ┆ b   ┆ a_interpolated ┆ b_interpolated │
#> │ ---  ┆ --- ┆ ---            ┆ ---            │
#> │ f64  ┆ f64 ┆ f64            ┆ f64            │
#> ╞══════╪═════╪════════════════╪════════════════╡
#> │ 1.0  ┆ 1.0 ┆ 1.0            ┆ 1.0            │
#> │ null ┆ NaN ┆ 2.0            ┆ NaN            │
#> │ 3.0  ┆ 3.0 ┆ 3.0            ┆ 3.0            │
#> └──────┴─────┴────────────────┴────────────────┘