Perform Recursive Computations R package rollupTree version 0.4.1 Mass rollup for a Bill of Materials is an example of a class of computations in which elements are arranged in a tree structure and some property of each element is a computed function of the corresponding values of its child elements. Leaf elements, i.e., those with no children, have values assigned. In many cases, the combining function is simple arithmetic sum; in other cases (e.g., mass properties), the combiner may involve other information such as the geometric relationship between parent and child, or statistical relations such as root-sum-of-squares (RSS). This package implements a general function for such problems. It is adapted to specific recursive computations by functional programming techniques; the caller passes a function as the update parameter to rollup() (or, at a lower level, passes functions as the get, set, combine, and override parameters to update_prop()) at runtime to specify the desired operations. The implementation relies on graph-theoretic algorithms from the 'igraph' package of Csárdi, et al. (2006 <doi:10.5281/zenodo.7682609>). Software Depends: R (>= 3.5) Imports: igraph Suggests: knitr, rmarkdown, testthat (>= 3.0.0) James Steven Jenkins <sjenkins@studioj.us> Comprehensive R Archive Network (CRAN) James Steven Jenkins [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-0725-0884>) MIT + file LICENSE (https://CRAN.R-project.org/package=rollupTree/LICENSE) 2026-02-10 application/tgz https://CRAN.R-project.org/package=rollupTree doi:10.32614/CRAN.package.rollupTree