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Compute inverse hyperbolic cosine

Source code

Description

Compute inverse hyperbolic cosine

Usage

<Expr>$arccosh()

Value

Expr

Examples

library("polars")

pl$DataFrame(a = c(-1, cosh(0.5), 0, 1, NA_real_))$
  with_columns(arccosh = pl$col("a")$arccosh())

#> shape: (5, 2)
#> ┌──────────┬─────────┐
#> │ a        ┆ arccosh │
#> │ ---      ┆ ---     │
#> │ f64      ┆ f64     │
#> ╞══════════╪═════════╡
#> │ -1.0     ┆ NaN     │
#> │ 1.127626 ┆ 0.5     │
#> │ 0.0      ┆ NaN     │
#> │ 1.0      ┆ 0.0     │
#> │ null     ┆ null    │
#> └──────────┴─────────┘