pub fn mean(&self) -> Self {
        let columns = self
            .columns
            .par_iter()
            .map(|s| s.mean_as_series())
            .collect();
        DataFrame::new_no_checks(columns)
    }
/// Aggregate the columns to their mean values.
Aggregate the columns to their mean values.
Aggregate the columns to their mean values .
pub fn mean(&self) -> Self {
        let columns = self
            .columns
            .par_iter()
            .map(|s| s.mean_as_series())
            .collect();
        DataFrame::new_no_checks(columns)
    }
pub fn mean ( & self ) -> Self { let columns = self . columns . par_iter ( ) . map ( | s | s . mean_as_series ( ) ) . collect ( ) ; DataFrame :: new_no_checks ( columns ) }
Aggregate the columns to their mean values.
Aggregate the columns to their mean values .
&self
&self