R Observatory: Metrics for collatz version 1.0.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

collatz

1.0.0Package record

Functions Related to the Collatz/Syracuse/3n+1 Problem

0packages depend

2.8Kdownloads / year

92.9%test coverage

13/13flavors OK

Overview

About

Maintained by Nathan LevettCRAN page ↗GitHub ↗Website ↗Issues ↗

Provides the basic functionality to interact with the Collatz conjecture. The parameterisation uses the same (P,a,b) notation as Conway's generalisations. Besides the function and reverse function, there is also functionality to retrieve the hailstone sequence, the "stopping time"/"total stopping time", or tree-graph. The only restriction placed on parameters is that both P and a can't be 0. For further reading, see https://en.wikipedia.org/wiki/Collatz_conjecture.

Install

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

install.packages("collatz", 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("Skenvy/Collatz")

Development version from Skenvy/Collatz. 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-collatz

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-collatz

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-collatz

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

13OK

CRAN check page ↗

Slowest check: 1.3 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-07-22
NOTE12 OK, 2 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 1.0.0

READMEYes · 211 wordsVignettesYes · 4 · dynamicNEWSNoCitation fileNoWebsiteYes

Help pages: 8includes a package overview page
Examples that run: 100%5 run in a plain check
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 0%

Vignettes (4)

How these are measured

Downloads

2.8K

CRAN downloads in the past year

Rank #14,863 · ~8/day · ~231/mo

Releases R versions

Daily download trend is not available in this view yet.

24930 days

81690 days

2.8K1 year

Compare downloads with other packages →

Also on85 r2u6 autocran

How downloads are counted

Repository

skenvy/collatz ↗Account: Skenvy

7Stars

1Forks

6Open issues

17Open PRs

44Releases

754Commits

3Commit identities

collatz

License file reads as Apache-2.0 · 754 commits · Last activity 2026-09-03 · 0% stars, 30d · Discussions: 1 post

Responsiveness

How these are sampled

PRs merged (all time): 50%
Median days to close, 50 most recently updated closed issues: 26
Median days to close, 50 most recently updated closed PRs: 21

Stars over time

2024-12-19 · 52026-07-07 · 7

How these are measured

PracticesBeta

13 development-tooling and community-health practices detected across 6 families in the upstream repository

Checks run against github.com/skenvy/collatz on 2026-10-21.

Continuous integration (1)

GitHub Actions

Governance and community (7)

Code of conductContributing guideIssue templatesPR templateFundingSecurity policy

Funding links: GitHub Sponsors

The repository owner accepts GitHub Sponsors

Docs source (2)

GitHub Pages site last deployed 2025-02-28 · The repository has a site deploy workflow

Automation and maintenance (1)

Dependabot

Show all practicesHide 2 practices

Lint, format, editor (1)

VS Code

Git structural (1)

.gitattributes

How this is detected·Detection ruleset v4 (2026-10-20)

Dependencies

Declared dependencies

11 external dependencies (excludes base and recommended)

Installing collatz adds 1 package (1 with compiled code, 163 KB of source tarballs). Heaviest: gmp 163 KB.

Depends (2)

R >= 3.5.0gmp

Imports (0)

none

LinkingTo (0)

none

Suggests (10)

roxygen2 testthat devtools covr DT pkgdown servr tinytex knitr rmarkdown

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

How these are counted

Code & Tests

People & History

People (1)

Nathan Levett

Author, Maintainer since 1.0.0 (2022)

Releases (1)

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
R
R 4.3.0 released · 2023-04-21
1.0.0Latest
record
2022-09-05 · current release
R
R 4.2.0 released · 2022-04-22

Package metadata

First published: 2022-09-05
Total releases: 1 / 4 yrs
License: Apache License (== 2.0)
Minimum R: ≥ 3.5.0
Download size: 51 KB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("collatz")

Format

Levett, N. (2022). collatz: Functions Related to the Collatz/Syracuse/3n+1 Problem (Version 1.0.0) [Computer software]. https://doi.org/10.32614/CRAN.package.collatz

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 collatz version 1.0.0 [Data set]. HJJB, LLC. Data release v2026-10-24. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-24, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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