polars.mean_horizontal#

polars.mean_horizontal(*exprs: IntoExpr | Iterable[IntoExpr]) → Expr[source]#

Compute the mean of all values horizontally across columns.

Parameters:

*exprs: Column(s) to use in the aggregation. Accepts expression input. Strings are parsed as column names, other non-expression inputs are parsed as literals.

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [1, 8, 3],
...         "b": [4, 5, None],
...         "c": ["x", "y", "z"],
...     }
... )
>>> df.with_columns(mean=pl.mean_horizontal("a", "b"))
shape: (3, 4)
┌─────┬──────┬─────┬──────┐
│ a   ┆ b    ┆ c   ┆ mean │
│ --- ┆ ---  ┆ --- ┆ ---  │
│ i64 ┆ i64  ┆ str ┆ f64  │
╞═════╪══════╪═════╪══════╡
│ 1   ┆ 4    ┆ x   ┆ 2.5  │
│ 8   ┆ 5    ┆ y   ┆ 6.5  │
│ 3   ┆ null ┆ z   ┆ 3.0  │
└─────┴──────┴─────┴──────┘