Struct ConstraintSensitivity 

#[non_exhaustive]
pub struct ConstraintSensitivity {
    pub shadow_price: Rational,
    pub slack: Rational,
    pub binding: bool,
    pub rhs_range: Interval,
    pub redundant: bool,
    pub source: Option<Source>,
}

Sensitivity of one constraint.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

shadow_price: Rational

Shadow price y_i: the change of the optimal objective per unit increase of the right-hand side b_i, valid while b_i stays within rhs_range.

This is the rate of change of z itself (as in Hillier & Lieberman or Excel), so it is positive when raising b_i increases z, also when minimizing. LINDO’s “dual price” is the improvement instead: the same value when maximizing, negated when minimizing.

slack: Rational

Unused amount at the optimum: b_i - a_i x for <=, a_i x - b_i for >=, and 0 for =.

binding: bool

The constraint holds with equality at the optimum (slack == 0).

rhs_range: Interval

Values of b_i (all else equal) for which the final basis stays feasible, hence optimal, with the same shadow prices. A free variable may change sign inside the range (its two columns trade places, which keeps the prices). A single point [b_i, b_i] for a redundant equality and for the equalities it depends on: moving any of them alone makes the constraints inconsistent.

redundant: bool

An equality that is a linear combination of other constraints, removed from the basis. Its shadow price is reported as 0 (it is not unique), and its right-hand side cannot change alone without making the problem infeasible.

source: Option<Source>

Where the shadow price can be read in the final tableau, if anywhere.

Trait Implementations

impl Clone for ConstraintSensitivity

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConstraintSensitivity

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ConstraintSensitivity

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ConstraintSensitivity

impl PartialEq for ConstraintSensitivity

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ConstraintSensitivity

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ConstraintSensitivity