Struct Quadratic 

pub struct Quadratic { /* private fields */ }

Separable quadratic f(x) = Σ (xᵢ − cᵢ)².

Strictly convex with a single global minimum of 0 at the center c. Its gradient is 2(x − c) and its Hessian is 2·I.

Implementations

impl Quadratic

pub const fn new(center: Vec<f64>) -> Self

Builds a quadratic with global minimum 0 at center.

Arguments

• center — the minimizer c; its length is the problem dimension.

Returns

A Quadratic whose Objective impl minimizes to center.

Trait Implementations

impl Clone for Quadratic

fn clone(&self) -> Quadratic

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Quadratic

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

Formats the value using the given formatter.

impl Objective for Quadratic

fn value(&self, x: &[f64]) -> f64

Evaluates the objective at x.

fn grad(&self, x: &[f64]) -> Vec<f64>

Evaluates the gradient ∇f(x).

fn hessian(&self, x: &[f64]) -> Vec<Vec<f64>>

Approximates the Hessian ∇²f(x) by central differences of the gradient.