Linear Compartment Model Solutions and Gradients for 'rxode2' R package rxode2lincmt version 0.1.0 Analytic one, two and three compartment linear pharmacokinetic solutions with their parameter gradients from 'stan' automatic differentiation (Carpenter et al (2015) <doi:10.48550/arXiv.1509.07164>), eigen decompositions and derived-parameter conversions used by 'rxode2' (Wang, Hallow and James (2016) <doi:10.1002/psp4.12052>). Split out of 'rxode2' so its installation does not compile 'stan' AD items which made it take too long to compile by itself. The closed-form solutions follow the idea of the 'wnl' package (Bae, <https://CRAN.R-project.org/package=wnl>), though the implementation here is different. Software Depends: R (>= 4.1.0) Imports: Rcpp (>= 1.0.8), checkmate LinkingTo: Rcpp (>= 1.0.8), RcppEigen (>= 0.3.3.9.2), StanHeaders (>= 2.21.0.7), BH, RcppParallel Suggests: covr, testthat (>= 3.0.0) Matthew L. Fidler <matthew.fidler@gmail.com> Comprehensive R Archive Network (CRAN) Matthew L. Fidler [aut, cre] (ORCID: <https://orcid.org/0000-0001-8538-6691>), Richard Upton [ctb] GPL (>= 3) 2026-09-24 application/tgz https://CRAN.R-project.org/package=rxode2lincmt doi:10.32614/CRAN.package.rxode2lincmt en-US