Expr.sign

methodView source ↗

def sign() -> Expr

Categories: numeric

Calculate the sign of element values.

Examples

>>> import tabsdata as td
>>>
>>> tf: td.TableFrame ...
>>>
>>> tf.select(td.col("val"), td.col("val").sign().alias("sign"))
>>>
┌────────┬──────┐
│ val    ┆ sign │
│ ---    ┆ ---  │
│ f64    ┆ f64  │
╞════════╪══════╡
│ 0.0123 ┆ 1.0  │
│ 2.0244 ┆ 1.0  │
│ 0.0    ┆ 0.0  │
│ inf    ┆ 1.0  │
│ -50.0  ┆ -1.0 │
│ 1.0    ┆ 1.0  │
│ NaN    ┆ NaN  │
│ null   ┆ null │
│ -112.0 ┆ -1.0 │
│ 2142.0 ┆ 1.0  │
└────────┴──────┘