Macro ode 

macro_rules! ode {
    ($($body:tt)*) => { ... };
}

Define an ODE (ordinary differential equation) model.

This is the primary entry point for building pharmacometric ODE models. The macro generates and validates an ODE model and automatically generates its metadata (parameter names, state labels, output labels, route declarations).

Fields

Field	Required	Description
name	yes	Model name ("my_model")
params	yes	Parameter identifiers [ka, ke, v]
covariates	no	Covariate identifiers [wt, age]
states	yes	State identifiers [gut, central]
outputs	yes	Output identifiers [cp]
routes	no	Route declarations [bolus(oral) -> gut, infusion(iv) -> central]
diffeq	yes	Closure |x, p, t, dx, cov| { … } writing derivatives into dx
lag	no	Closure returning route‑specific lag times via lag! { route => expr }
fa	no	Closure returning bioavailability fractions
init	no	Closure setting initial state values
out	yes	Closure |x, p, t, cov, y| { … } mapping states to outputs
crate	no	Escape hatch to override the resolved pharmsol path, e.g. "my_vendor::pharmsol"

Example

let model = ode! {
    name: "one_cmt_iv",
    params: [ke, v],
    states: [central],
    outputs: [cp],
    routes: [infusion(iv) -> central],
    diffeq: |x, _p, _t, dx, _cov| {
        dx[central] = -ke * x[central];
    },
    out: |x, _p, _t, _cov, y| {
        y[cp] = x[central] / v;
    },
};