Method: Polars::Expr#sub

Defined in:
lib/polars/expr.rb

#sub(other) ⇒ Expr

Method equivalent of subtraction operator expr - other.

Examples:

df = Polars::DataFrame.new({"x" => [0, 1, 2, 3, 4]})
df.with_columns(
  Polars.col("x").sub(2).alias("x-2"),
  Polars.col("x").sub(Polars.col("x").cum_sum).alias("x-expr"),
)
# =>
# shape: (5, 3)
# ┌─────┬─────┬────────┐
# │ x   ┆ x-2 ┆ x-expr │
# │ --- ┆ --- ┆ ---    │
# │ i64 ┆ i64 ┆ i64    │
# ╞═════╪═════╪════════╡
# │ 0   ┆ -2  ┆ 0      │
# │ 1   ┆ -1  ┆ 0      │
# │ 2   ┆ 0   ┆ -1     │
# │ 3   ┆ 1   ┆ -3     │
# │ 4   ┆ 2   ┆ -6     │
# └─────┴─────┴────────┘

Parameters:

  • other (Object) —

    Numeric literal or expression value.

Returns:

[View source]

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# File 'lib/polars/expr.rb', line 3598

def sub(other)
  self - other
end