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Fill nulls

Source code

Description

Fill null values (which correspond to NA in R) using the specified value or strategy.

Usage

<DataFrame>$fill_null(fill_value)

Arguments

fill_value Value to fill nulls with.

Value

DataFrame

Examples

library("polars")

df = pl$DataFrame(
  a = c(1.5, 2, NA, 4),
  b = c(1.5, NA, NA, 4)
)

df$fill_null(99)

#> shape: (4, 2)
#> ┌──────┬──────┐
#> │ a    ┆ b    │
#> │ ---  ┆ ---  │
#> │ f64  ┆ f64  │
#> ╞══════╪══════╡
#> │ 1.5  ┆ 1.5  │
#> │ 2.0  ┆ 99.0 │
#> │ 99.0 ┆ 99.0 │
#> │ 4.0  ┆ 4.0  │
#> └──────┴──────┘

df$fill_null(pl$col("a")$mean())

#> shape: (4, 2)
#> ┌─────┬─────┐
#> │ a   ┆ b   │
#> │ --- ┆ --- │
#> │ f64 ┆ f64 │
#> ╞═════╪═════╡
#> │ 1.5 ┆ 1.5 │
#> │ 2.0 ┆ 2.5 │
#> │ 2.5 ┆ 2.5 │
#> │ 4.0 ┆ 4.0 │
#> └─────┴─────┘