Substract two expressions

Source code

Description

Method equivalent of subtraction operator expr - other.

Usage

<Expr>$sub(other)

Arguments

other

Numeric literal or expression value.

Value

Expr

See Also

• Arithmetic operators

Examples

library("polars")

df = pl$DataFrame(x = 0:4)

df$with_columns(
  `x-2` = pl$col("x")$sub(2),
  `x-expr` = pl$col("x")$sub(pl$col("x")$cum_sum())
)

#> shape: (5, 3)
#> ┌─────┬──────┬────────┐
#> │ x   ┆ x-2  ┆ x-expr │
#> │ --- ┆ ---  ┆ ---    │
#> │ i32 ┆ f64  ┆ i32    │
#> ╞═════╪══════╪════════╡
#> │ 0   ┆ -2.0 ┆ 0      │
#> │ 1   ┆ -1.0 ┆ 0      │
#> │ 2   ┆ 0.0  ┆ -1     │
#> │ 3   ┆ 1.0  ┆ -3     │
#> │ 4   ┆ 2.0  ┆ -6     │
#> └─────┴──────┴────────┘