S7 Data Structures for Diffusion MRI Tractography R package fiber version 0.2.0 Provides three S7 classes — streamline, bundle, and bundle_set — for representing diffusion MRI tractography data in R, together with a concise set of methods for computing shape descriptors (arc-length, curvature, torsion, sinuosity), the Hausdorff distance between streamlines, arc-length reparametrization of streamlines and bundles onto uniform grids, combination of streamlines or bundles into a single bundle, combination of bundles from multiple subjects or sessions into a bundle_set, and coercion to and from the dwiFiber S4 class of the 'dti' package. See Dell'Acqua, F., Descoteaux, M. and Leemans, A. (2024) "Handbook of Diffusion MR Tractography" <doi:10.1016/C2018-0-02520-7> for more about the mathematical and computational underpinnings of diffusion MRI tractography. Software Imports: cli, methods, S7 LinkingTo: cpp11 Suggests: dti, tinytest Aymeric Stamm <aymeric.stamm@cnrs.fr> Comprehensive R Archive Network (CRAN) Aymeric Stamm [aut, cre] (ORCID: <https://orcid.org/0000-0002-8725-3654>) MIT + file LICENSE (https://CRAN.R-project.org/package=fiber/LICENSE) 2026-07-04 application/tgz https://CRAN.R-project.org/package=fiber doi:10.32614/CRAN.package.fiber