Enum ParamDisposition 

pub enum ParamDisposition {
    Fixed,
    Solved,
    Considered,
}

What a fit did with one parameter axis.

The three answers are different operations with different mathematics, and using one where another is meant is silent — each produces a well-formed covariance.

There is deliberately no From<bool> and no Default. An axis’s disposition is a modelling statement, and a conversion that turned true into Solved would let a call site inherit one rather than state it.

Variants

Fixed

Marginalized out of the prior. Contributes nothing and changes no number.

Solved

Estimated from the data: occupies a solved slot and comes back with a posterior variance.

Considered

Not estimated, but uncertain — its prior uncertainty reaches the posterior through its measurement partials (Schmidt–Kalman consider analysis; Tapley, Byron D., Schutz, Bob E., and Born, George H., Statistical Orbit Determination, Elsevier Academic Press, 2004, ch. 6).

Not a safety margin: under an uncorrelated prior the correction strictly widens the posterior, but with cross terms between the considered axis and the solved ones the correction is sign-indefinite and the posterior can come back tighter.

Implementations

impl ParamDisposition

pub const fn is_solved(self) -> bool

Whether this axis is estimated.

pub const fn is_considered(self) -> bool

Whether this axis inflates the posterior through consider analysis.

pub const fn as_tag(self) -> &'static str

The canonical wire tag: "fixed", "solved", "considered".

pub fn from_tag(tag: &str) -> Result<Self>

Parse the canonical wire tag. An unrecognized tag is an error, never a default.

Trait Implementations

impl Clone for ParamDisposition

fn clone(&self) -> ParamDisposition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ParamDisposition

impl Debug for ParamDisposition

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

Formats the value using the given formatter.

impl Eq for ParamDisposition

impl Hash for ParamDisposition

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ParamDisposition

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParamDisposition