Enum PeerPenalty 

pub enum PeerPenalty {
    Ridge,
    Difference {
        order: usize,
    },
    Decree(Vec<f64>, usize),
}

Penalty family for the PEER estimator.

Selects the penalty matrix Q (m×m) entering the penalized normal equations (W_c'W_c + λQ)β = W_c'y_c.

Variants

Ridge

Identity penalty Q = I_m (uniform ridge shrinkage).

Difference

Second-difference roughness penalty Q = D’D (only order = 2 is supported in this release; other orders return FdarError::InvalidParameter).

Fields

order: usize

Decree(Vec<f64>, usize)

Caller-supplied penalty matrix.

The tuple holds (q_flat, p) where q_flat is a flat row-major m×m symmetric PSD matrix (length p*p) and p is its dimension. p must equal the number of argvals grid points m; a mismatch returns FdarError::InvalidDimension.

Q must be symmetric (row-major and column-major are equivalent for symmetric matrices) and positive semi-definite for Cholesky stability.

Trait Implementations

impl Clone for PeerPenalty

fn clone(&self) -> PeerPenalty

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PeerPenalty

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

Formats the value using the given formatter.

impl Default for PeerPenalty

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for PeerPenalty

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PeerPenalty