riemtan: Riemannian Metrics for Symmetric Positive Definite Matrices

Implements various Riemannian metrics for symmetric positive definite matrices, including AIRM (Affine Invariant Riemannian Metric, <doi:10.1007/s11263-005-3222-z>), Log-Euclidean (<doi:10.1002/mrm.20965>), Euclidean, Log-Cholesky (<doi:10.1137/18M1221084>), and Bures-Wasserstein metrics (<doi:10.1016/j.exmath.2018.01.002>). Provides functions for computing logarithmic and exponential maps, vectorization, and statistical operations on the manifold of positive definite matrices.

Version: 0.2.5
Depends: R (≥ 4.3.0)
Imports: arrow, future, furrr, jsonlite, Matrix, methods, R6, purrr, MASS, matrixStats, Rcpp (≥ 1.0.0)
LinkingTo: Rcpp, RcppEigen
Suggests: progressr, testthat (≥ 3.0.0), knitr, rmarkdown
Published: 2025-11-10
DOI: 10.32614/CRAN.package.riemtan
Author: Nicolas Escobar ORCID iD [aut, cre], Jaroslaw Harezlak [ths]
Maintainer: Nicolas Escobar <nescoba at iu.edu>
BugReports: https://github.com/nicoesve/riemtan/issues
License: MIT + file LICENSE
URL: https://nicoesve.github.io/riemtan/
NeedsCompilation: yes
Materials: README, NEWS
CRAN checks: riemtan results

Documentation:

Reference manual: riemtan.html , riemtan.pdf
Vignettes: Performance Benchmarking and Optimization (source, R code)
riemtan: Statistical Analysis of Connectomes using Riemannian Geometry (source, R code)
Using Parquet Storage for Large Datasets (source, R code)

Downloads:

Package source: riemtan_0.2.5.tar.gz
Windows binaries: r-devel: riemtan_0.1.0.zip, r-release: riemtan_0.1.0.zip, r-oldrel: riemtan_0.1.0.zip
macOS binaries: r-release (arm64): riemtan_0.2.5.tgz, r-oldrel (arm64): riemtan_0.2.5.tgz, r-release (x86_64): riemtan_0.2.5.tgz, r-oldrel (x86_64): riemtan_0.2.5.tgz
Old sources: riemtan archive

Linking:

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