Struct ClassicalPI 

pub struct ClassicalPI<F: SemiflowFloat> {
    pub alpha: F,
    pub beta: F,
    /* private fields */
}

Söderlind 2002 “PI.4.7” step-size law (NORMATIVE default).

Gains: α = 0.7/p, β = 0.4/p (math.md §11.1.bis). Bit-identical to the v1.0.0 inlined pi_step_factor / reject_step_factor helpers (ADR-0044).

The FP association safety * e * e_prev (left-to-right) is NORMATIVE and enforced by tests/adaptive_classical_bit_equal.rs.

Fields

alpha: F

Söderlind PI.4.7 P-gain exponent α = 0.7 / p.

beta: F

Söderlind PI.4.7 I-gain exponent β = 0.4 / p.

Implementations

impl<F: SemiflowFloat> ClassicalPI<F>

pub fn with_order(p: u32) -> Self

Construct with §11.1.bis gains for the given inner order p.

pub fn new(alpha: F, beta: F) -> Self

Direct constructor for tests and advanced users.

pub fn alpha(&self) -> F

Return the current alpha (P-gain exponent).

pub fn beta(&self) -> F

Return the current beta (I-gain exponent).

Trait Implementations

impl<F: Clone + SemiflowFloat> Clone for ClassicalPI<F>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<F: Debug + SemiflowFloat> Debug for ClassicalPI<F>

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

Formats the value using the given formatter.

impl<F: SemiflowFloat> Default for ClassicalPI<F>

fn default() -> Self

Defaults assume p = 2 (matches DiffusionChernoff::order() post-D1).

impl<F: SemiflowFloat> StepController<F> for ClassicalPI<F>

fn propose_accept(&mut self, err_norm: F, tol: F, safety: F, _p: u32) -> F

Called after a substep is accepted.

fn propose_reject(&mut self, err_norm: F, tol: F, safety: F, _p: u32) -> F

Called after a substep is rejected.

fn reset(&mut self)

Reset internal state to initial conditions.