Enum ExactADirectionClassification 

pub enum ExactADirectionClassification {
    ResolvedPositive {
        curvature: f64,
    },
    NumericalNull,
    ClampBasin {
        curvature: f64,
    },
    Saddle {
        curvature: f64,
        basin: f64,
    },
}

One route-independent classification of an eigendirection of the raw exact observed information A = B_raw + delta_C (#2515).

Both dense and arrow evidence lanes must ask this function before deciding whether a direction is identified, a bounded prior-clamp wrinkle, or a true saddle. Keeping the decision as a typed result prevents the historical drift where dense used the majorizer pencil plus clamp basin while arrow used a local relative eigenvalue and rejected every negative direction.

Variants

ResolvedPositive

Curvature is positive and identifiable in the majorizer metric.

Fields

curvature: f64

NumericalNull

Curvature lies inside the common numerical-null band and contributes the route-independent quotient constant log(1) = 0.

ClampBasin

Raw A is negative, but all of the negativity is the exactly known, bounded concave clamp omitted by the PSD majorizer. Evidence is priced at the positive coarse-grained basin curvature.

Fields

curvature: f64

Saddle

Negative curvature remains after the clamp is restored: this state is a saddle, not a mode, and evidence must refuse it.

Fields

curvature: f64

basin: f64

Trait Implementations

impl Clone for ExactADirectionClassification

fn clone(&self) -> ExactADirectionClassification

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ExactADirectionClassification

impl Debug for ExactADirectionClassification

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

Formats the value using the given formatter.

impl PartialEq for ExactADirectionClassification

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ExactADirectionClassification