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 [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_0.2.5.zip, r-release: riemtan_0.2.5.zip, r-oldrel: riemtan_0.2.5.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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