Method: Polars::Selectors.signed_integer

Defined in:

lib/polars/selectors.rb

.signed_integer ⇒ Selector

Select all signed integer columns.

Examples:

df = Polars::DataFrame.new(
  {
    "foo" => [-123, -456],
    "bar" => [3456, 6789],
    "baz" => [7654, 4321],
    "zap" => ["ab", "cd"]
  },
  schema_overrides: {"bar" => Polars::UInt32, "baz" => Polars::UInt64}
)

Select all signed integer columns:

df.select(Polars.cs.signed_integer)
# =>
# shape: (2, 1)
# ┌──────┐
# │ foo  │
# │ ---  │
# │ i64  │
# ╞══════╡
# │ -123 │
# │ -456 │
# └──────┘

df.select(~Polars.cs.signed_integer)
# =>
# shape: (2, 3)
# ┌──────┬──────┬─────┐
# │ bar  ┆ baz  ┆ zap │
# │ ---  ┆ ---  ┆ --- │
# │ u32  ┆ u64  ┆ str │
# ╞══════╪══════╪═════╡
# │ 3456 ┆ 7654 ┆ ab  │
# │ 6789 ┆ 4321 ┆ cd  │
# └──────┴──────┴─────┘

Select all integer columns (both signed and unsigned):

df.select(Polars.cs.integer)
# =>
# shape: (2, 3)
# ┌──────┬──────┬──────┐
# │ foo  ┆ bar  ┆ baz  │
# │ ---  ┆ ---  ┆ ---  │
# │ i64  ┆ u32  ┆ u64  │
# ╞══════╪══════╪══════╡
# │ -123 ┆ 3456 ┆ 7654 │
# │ -456 ┆ 6789 ┆ 4321 │
# └──────┴──────┴──────┘

Returns:

• (Selector)

# File 'lib/polars/selectors.rb', line 1511

def self.signed_integer
  Selector._from_rbselector(RbSelector.signed_integer)
end