Bayesian Additive Regression Trees with Ridge Function Outputs R package ridgeBART version 1.0.2 Implements an extension of Bayesian Additive Regression Trees (BART) in which each regression tree outputs a linear combination of random ridge functions (i.e., a composition of a non-linear function like cosine, hyperbolic tangent, the rectified linear unit with an affine transformation) instead of a constant. Can be used to perform "targeted smoothing" in which trees split on certain covariates but output smooth functions in other covariates. For more information, see Yee, Ghosh, and Deshpande (2026+) <doi:10.48550/arXiv.2411.07984>. Software Imports: Rcpp LinkingTo: Rcpp, RcppArmadillo Sameer K. Deshpande <sameer.deshpande@wisc.edu> Comprehensive R Archive Network (CRAN) Ryan Yee [aut] (ORCID: <https://orcid.org/0009-0005-5691-4009>), Sameer K. Deshpande [aut, cre] (ORCID: <https://orcid.org/0000-0003-4116-5533>) GPL (>= 3) 2026-05-27 application/tgz https://CRAN.R-project.org/package=ridgeBART doi:10.32614/CRAN.package.ridgeBART