polars.Series.max_by

Series.max_by(by: IntoExpr) → Expr

Get the maximum value in this Series, ordered by an expression.

Warning

This functionality is considered unstable. It may be changed at any point without it being considered a breaking change.

Parameters:

by

Column used to determine the largest element. Accepts expression input. Strings are parsed as column names.

Examples

>>> s = pl.Series("a", [-2.0, float("nan"), 1.0])
>>> s.max_by(pl.col.a.abs())
-2.0