R Observatory: Metrics for einsum version 0.2.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

einsum

0.2.0Package record

Einstein Summation

3packages depend

6.2Kdownloads / year

93.6%test coverage

11/13flavors OK

Overview

About

Maintained by Constantin Ahlmann-EltzeCRAN page ↗GitHub ↗Website ↗Issues ↗

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.

Changes in 0.2.0

Optimize einsum() via BLAS matrix multiply and greedy pairwise contraction for 3+ tensor equations.
Optimize einsum_generator() to emit pairwise C++ code for 3+ tensor equations instead of a single loop nest.
Refactor shared equation parsing into einsum_parse.R.
Update GitHub Actions workflows to current runners and actions.

From NEWS.md in the release

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("einsum", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("const-ae/einsum")

Development version from const-ae/einsum. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-einsum

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-einsum

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-einsum

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

2NOTE11OK

Check messages

NOTEdependencies in R coder-devel-linux-x86_64-fedora-clang, r-devel-linux-x86_64-fedora-gcc

Namespace in Imports field not imported from:
  ‘mathjaxr’
All declared Imports should be used.

CRAN check page ↗

Slowest check: 5.2 min · r-devel-windows-x86_64

Status changes

NOTE11 OK, 2 NOTENow
NOTE12 OK, 2 NOTE2026-04-22
ERROR11 OK, 2 NOTE, 1 ERROR2026-04-18
NOTE12 OK, 2 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.2.0

READMEYes · 298 wordsVignettesNoNEWSYes · 100% structured · mentions 0.2.0Citation fileNoWebsiteYes · pkgdown

Help pages: 2includes a package overview page
Examples that run: 100%1 run in a plain check
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 0%

How these are measured

Downloads

6.2K

CRAN downloads in the past year

Rank #5,856 · ~17/day · ~521/mo

Releases R versions

Daily download trend is not available in this view yet.

49330 days

1.4K90 days

6.2K1 year

Compare downloads with other packages →

Also on410 r2u3 autocran2.6K conda_forge

How downloads are counted

Repository

const-ae/einsum ↗Account: const-ae

12Stars

2Forks

0Open issues

0Open PRs

2Releases

70Commits

2Commit identities

70 commits · Last activity 2026-07-08 · 0% stars, 30d

Responsiveness

How these are sampled

PRs merged (all time): 50%
Median days to close, 50 most recently updated closed issues: 0
Median days to close, 50 most recently updated closed PRs: 46

Stars over time

2024-11-15 · 112026-07-07 · 12

How these are measured

PracticesBeta

8 development-tooling and community-health practices detected across 4 families in the upstream repository

Checks run against github.com/const-ae/einsum on 2026-10-18.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Docs source (4)

README.Rmdpkgdown

GitHub Pages site last deployed 2026-07-08 · The repository has a site deploy workflow

Coverage (1)

Coverage reporting (Codecov)

CRAN release process (1)

cran-comments.md

How this is detected·Detection ruleset v3 (2026-09-26)

AI coding toolsBeta

This repository shows signs of AI coding tools.

Claude Codefirst seen 2026-04-05
Named in .Rbuildignore: CLAUDE.md
Commits: at least 7 crediting it in the message

From outside contributors

Claude Code
Pull requests: 3 from outside contributors, first on 2026-04-05, 3 from forks

Models named in its commits

Claude Opus 4.67 commits · Apr to Jul 2026

Counts are commits, not lines of code. Commits by a tool's accounts count once across all of its accounts. Commits crediting it are the largest count among its credit lines, a minimum.How this is detected·Detection ruleset v4 (updated 2026-09-27)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Installing einsum adds 3 packages (2 with compiled code, 4.9 MB of source tarballs). Heaviest: mathjaxr 3.0 MB, Rcpp 1.8 MB, glue 127 KB.

Depends (0)

none

Imports (3)

Rcpp glue mathjaxr

LinkingTo (1)

Rcpp

Suggests (2)

testthat covr

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

3direct

1indirect

Imports 3

Depends, Imports or LinkingTo, most downloaded first

iTensor impala gcTensor

How these are counted

Code & Tests

People & History

People (2)

Constantin Ahlmann-Eltze

Author, Maintainer since 0.1.0 (2021)

Koki Tsuyuzaki

Author · added in 0.2.0

Releases (3)

Pick two releases to compare their code metrics.

0.2.0Latest
record
2026-07-09 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
0.1.2
record
2023-08-28 · diff ↗
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
0.1.0
record
2021-05-18
R
R 4.1.0 released · 2021-05-18
R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2021-05-18
Total releases: 3 / 5 yrs
License: MIT + file LICENSE OSI
Download size: 25 KB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("einsum")

Format

Ahlmann-Eltze, C., & Tsuyuzaki, K. (2026). einsum: Einstein Summation (Version 0.2.0) [Computer software]. https://doi.org/10.32614/CRAN.package.einsum

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for einsum version 0.2.0 [Data set]. HJJB, LLC. Data release v2026-10-22. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-22, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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