Function polars::prelude::cum_fold_exprs

pub fn cum_fold_exprs<F, E>(
    acc: Expr,
    f: F,
    exprs: E,
    include_init: bool
) -> Expr
where
    F: 'static + Fn(Series, Series) -> Result<Option<Series>, PolarsError> + Send + Sync + Clone,
    E: AsRef<[Expr]>,

Available on crate features lazy and dtype-struct only.

Accumulate over multiple columns horizontally / row wise.