Function two_compartments_cl_with_absorption 

pub fn two_compartments_cl_with_absorption(
    x: &NalgebraVec<f64>,
    p: &NalgebraVec<f64>,
    t: f64,
    rateiv: &NalgebraVec<f64>,
    cov: &Covariates,
) -> NalgebraVec<f64>

Analytical solution for two compartment model with first-order absorption, parameterized by clearances.

Converts CL/Q/Vc/Vp to ke/kcp/kpc and delegates to two_compartments_with_absorption.

Assumptions

• p is a vector of length 5 with ka, CL, Q, Vc and Vp in that order
• rateiv is a vector of length 1 with the value of the infusion rate (only one drug)
• x is a vector of length 3
• covariates are not used