Enum Extrapolation 

pub enum Extrapolation {
    Constant,
    Linear,
    Continue,
    Periodic,
    Error,
}

How to handle values outside the base knot interval [xmin, xmax].

Mirrors scikit-learn’s extrapolation parameter (sklearn/preprocessing/_polynomial.py:707-709,:721). The default is Extrapolation::Constant (sklearn’s __init__ default extrapolation="constant", _polynomial.py:721).

Only Extrapolation::Constant is currently implemented. The remaining sklearn modes (linear, continue, periodic, error) are NOT-STARTED and surface a FerroError::InvalidParameter from the transform.

Variants

Constant

Clamp out-of-range values to the boundary spline basis: for x < xmin the basis is evaluated at xmin, for x > xmax at xmax. This is the DEFAULT, matching sklearn extrapolation="constant" (_polynomial.py:721 default; the constant clamp at :1059-1087 sets the out-of-range row’s first/last degree basis columns to the boundary basis values f_min[:degree] / f_max[-degree:] — equivalent to clamping x to [xmin, xmax] before evaluating the basis, since the columns beyond degree are zero at the boundary).

Linear

Linearly continue the boundary splines (sklearn "linear", _polynomial.py:1089-1123). NOT-STARTED.

Continue

Pass scipy extrapolate=True (sklearn "continue"). NOT-STARTED.

Periodic

Periodic splines (sklearn "periodic"). NOT-STARTED.

Error

Raise on out-of-range input (sklearn "error", _polynomial.py:1047-1058). NOT-STARTED.

Trait Implementations

impl Clone for Extrapolation

fn clone(&self) -> Extrapolation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Extrapolation

impl Debug for Extrapolation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Extrapolation

fn default() -> Extrapolation

Returns the “default value” for a type.

impl Eq for Extrapolation

impl PartialEq for Extrapolation

fn eq(&self, other: &Extrapolation) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Extrapolation