Compute the logarithm

Description

Compute the logarithm

Usage

<Expr>$log(base = exp(1))

Arguments

base	Numeric value used as base, defaults to exp(1).

Value

A polars expression

Examples

library("polars")

pl$DataFrame(a = c(1, 2, 4))$
  with_columns(
  log = pl$col("a")$log(),
  log_base_2 = pl$col("a")$log(base = 2)
)

#> shape: (3, 3)
#> ┌─────┬──────────┬────────────┐
#> │ a   ┆ log      ┆ log_base_2 │
#> │ --- ┆ ---      ┆ ---        │
#> │ f64 ┆ f64      ┆ f64        │
#> ╞═════╪══════════╪════════════╡
#> │ 1.0 ┆ 0.0      ┆ 0.0        │
#> │ 2.0 ┆ 0.693147 ┆ 1.0        │
#> │ 4.0 ┆ 1.386294 ┆ 2.0        │
#> └─────┴──────────┴────────────┘