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ContractFeasibleStep

gam_problem

Struct ContractFeasibleStep 

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pub struct ContractFeasibleStep {
    pub fraction: f64,
    pub blocking_row: Option<usize>,
    pub blocking_scaled_slack: f64,
    pub blocking_scaled_drift: f64,
}
Expand description

Result of the contract-feasible ratio test (ConstraintSet::max_contract_feasible_step).

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§fraction: f64

Largest fraction in [0, 1] such that β + fraction·δ is feasible at PRIMAL_FEASIBILITY_TOL. 1.0 means no row limits the step.

0.0 is a legitimate, non-exceptional answer: it says a row is active at β and δ points strictly out of it by more than round-off, so no positive multiple of δ is admissible. The remedy is a projection onto the active face, not a smaller δ — the ratio test is invariant under δ ↦ cδ once the numerator is zero, so shrinking a trust radius against it cannot converge (gam#2719).

§blocking_row: Option<usize>

Row that limited fraction, if any.

§blocking_scaled_slack: f64

Scaled slack (a·β − b)/‖a‖ of blocking_row at β.

§blocking_scaled_drift: f64

Scaled drift (a·δ)/‖a‖ of blocking_row (strictly negative when a row blocks).

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impl ContractFeasibleStep

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pub const UNLIMITED: Self

The unlimited answer: the whole direction is admissible.

Trait Implementations§

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impl Clone for ContractFeasibleStep

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fn clone(&self) -> ContractFeasibleStep

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for ContractFeasibleStep

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impl Debug for ContractFeasibleStep

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

Formats the value using the given formatter. Read more
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impl PartialEq for ContractFeasibleStep

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for ContractFeasibleStep

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