Einstein Summation R package einsum version 0.2.0 The summation notation suggested by Einstein (1916) <doi:10.1002/andp.19163540702> is a concise mathematical notation that implicitly sums over repeated indices of n-dimensional arrays. Many ordinary matrix operations (e.g. transpose, matrix multiplication, scalar product, 'diag()', trace etc.) can be written using Einstein notation. The notation is particularly convenient for expressing operations on arrays with more than two dimensions because the respective operators ('tensor products') might not have a standardized name. Software Imports: Rcpp, glue, mathjaxr LinkingTo: Rcpp Suggests: testthat, covr Constantin Ahlmann-Eltze <artjom31415@googlemail.com> Comprehensive R Archive Network (CRAN) Constantin Ahlmann-Eltze [aut, cre] (ORCID: <https://orcid.org/0000-0002-3762-068X>), Koki Tsuyuzaki [aut] (ORCID: <https://orcid.org/0000-0003-3797-2148>) MIT + file LICENSE (https://CRAN.R-project.org/package=einsum/LICENSE) 2026-07-09 application/tgz https://CRAN.R-project.org/package=einsum doi:10.32614/CRAN.package.einsum