Macro analytical 

analytical!() { /* proc-macro */ }

Define an analytical (closed‑form) PK model.

Builds a model that uses a built‑in analytical solution. The macro validates that the declared parameters match the chosen analytical solution’s requirements and generates an Analytical value with full metadata.

Fields

Field	Required	Description
name	yes	Model name
params	yes	Parameter identifiers
derived	no	Derived parameter identifiers (computed in derive)
covariates	no	Covariate identifiers
states	yes	State identifiers
outputs	yes	Output identifiers
routes	no	Route declarations
structure	yes	Built‑in kernel name, e.g. one_compartment or one_compartment_with_absorption
derive	no	Closure |t| { … } computing derived parameters from primaries and covariates
lag	no	Lag‑time closure
fa	no	Bioavailability closure
init	no	Initial‑state closure
out	yes	Output mapping closure

Example

let model = analytical! {
    name: "one_cmt_oral",
    params: [ka, ke, v],
    states: [gut, central],
    outputs: [cp],
    routes: [bolus(oral) -> gut],
    structure: one_compartment_with_absorption,
    out: |x, _t, y| {
        y[cp] = x[central] / v;
    },
};