R Observatory: Metrics for samc version 4.2.1

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

samc

4.2.1Package record

Spatial Absorbing Markov Chains

0packages depend

7.5Kdownloads / year

52.9%test coverage

13/13flavors OK

Overview

About

Maintained by Andrew MarxCRAN page ↗GitHub ↗Website ↗Issues ↗

Implements functions for working with absorbing Markov chains. The implementation is based on the framework described in "Toward a unified framework for connectivity that disentangles movement and mortality in space and time" by Fletcher et al. (2019) doi:10.1111/ele.13333, which applies them to spatial ecology. This framework incorporates both resistance and absorption with spatial absorbing Markov chains (SAMC) to provide several short-term and long-term predictions for metrics related to connectivity in landscapes. Despite the ecological context of the framework, this package can be used in any application of absorbing Markov chains.

Changes in 4.2.1

CRW optimizations and enhancements

From NEWS.md in the release

Install

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

install.packages("samc", 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("andrewmarx/samc")

Development version from andrewmarx/samc. 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-samc

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-samc

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-samc

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: 18.2 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-10-15
ERROR12 OK, 1 ERROR2026-09-25
OK13 OK2026-08-04
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-06-09

Show 6 earlier changesHide 6 earlier changes

ERROR12 OK, 1 ERROR2026-06-08
WARNING12 OK, 1 WARNING2026-06-07
OK12 OK2026-04-25
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 4.2.1

README· In the repository, left out of the releaseVignettesYes · 1 · staticNEWSYes · 100% structured · mentions 4.2.1Citation fileYes · cites a publicationWebsiteYes · pkgdown

Help pages: 24 (5 internal)
Examples that run: 100%14 run in a plain check
Exported functions with examples: 100%
Documented parameters: not tracked
Return-value docs: not tracked
Help pages citing references: 0%

Vignettes (1)

Overview HTML

How these are measured

Downloads

7.5K

CRAN downloads in the past year

Rank #4,824 · ~21/day · ~629/mo

Releases R versions

Daily download trend is not available in this view yet.

66430 days

1.7K90 days

7.5K1 year

Compare downloads with other packages →

Also on380 r2u5 autocran

How downloads are counted

Repository

andrewmarx/samc ↗Account: andrewmarx

15Stars

5Forks

4Open issues

0Open PRs

13Releases

768Commits

1Commit identities

absorbing-markov-chainsconnectivitycranlandscape-ecologylandscape-metricsmarkov-chainr

License file reads as AGPL-3.0 · 768 commits · Last activity 2026-01-16 · 0% stars, 30d · The default branch showed an older version (4.0.0) than CRAN on 2026-10-18 · Discussions: 8 posts

Responsiveness

How these are sampled

PRs merged (all time): 0%
Median days to close, 50 most recently updated closed issues: 140
Median days to close, 50 most recently updated closed PRs: 1

Stars over time

2025-05-01 · 142026-07-07 · 15

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/andrewmarx/samc on 2026-10-18.

Continuous integration (1)

GitHub Actions

Docs source (3)

pkgdown

GitHub Pages site last deployed 2026-01-16 · The repository has a site deploy workflow

pkgdown site last built 2026-01-16, before release 4.2.1 (2026-03-13)

CRAN release process (2)

cran-comments.mdCRAN-SUBMISSION

Lint, format, editor (2)

lintrRStudio project

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

Dependencies

Declared dependencies

10 external dependencies (excludes base and recommended)

Installing samc adds 6 packages (6 with compiled code, 10 MB of source tarballs). Heaviest: sp 4.3 MB, Rcpp 1.8 MB, RcppEigen 1.7 MB.

Depends (1)

R >= 3.6.0

Imports (4)

methodsMatrixraster terra

LinkingTo (3)

Rcpp RcppEigen RcppThread (>= 2.1.3)

Suggests (5)

knitr rmarkdown testthat gdistance viridisLite

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

How these are counted

Code & Tests

Datasets

People & History

People (7)

Contributor

Contributor

Contributor · added in 3.1.0

Hughes Josie

Contributor · added in 3.1.0

Jorge Sefair

Contributor

Chao Wang

Contributor

Releases (18)

Pick two releases to compare their code metrics.

R
R 4.6.0 released · 2026-04-24
4.2.1Latest
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2026-03-13 · current release · diff ↗
4.1.0
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2026-02-05 · diff ↗
R
R 4.5.0 released · 2025-04-11
4.0.0
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2024-10-30 · diff ↗
3.3.0
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2024-07-11 · diff ↗
R
R 4.4.0 released · 2024-04-24
3.2.1
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2023-05-09 · diff ↗
3.2.0
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2023-05-04 · diff ↗
R
R 4.3.0 released · 2023-04-21
3.1.0
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2023-04-07 · diff ↗
3.0.2
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2023-02-01 · diff ↗
2.0.1
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2022-06-11 · diff ↗
R
R 4.2.0 released · 2022-04-22
2.0.0
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2021-10-23 · diff ↗
1.4.1
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2021-09-02 · diff ↗

Show 10 earlier eventsHide 10 earlier events

1.4.0
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2021-06-27 · diff ↗
R
R 4.1.0 released · 2021-05-18
1.3.0
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2021-04-01 · diff ↗
1.2.1
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2020-11-03 · diff ↗
1.2.0
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2020-10-14 · diff ↗
1.1.0
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2020-05-19 · diff ↗
R
R 4.0.0 released · 2020-04-24
1.0.4
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2020-01-08 · diff ↗
1.0.3
record
2019-08-21
R
R 3.6.0 released · 2019-04-26

Package metadata

First published: 2019-08-21
Total releases: 18 / 7 yrs
License: AGPL (>= 3) OSI · relicensed from GPL (>= 3) in 3.3.0
Minimum R: ≥ 3.6.0
Bundled data: 3.1 KB / 3 files
Download size: 570 KB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("samc")

The package provides a citation file that builds its entry when R runs it. Run citation() to see it.

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 samc version 4.2.1 [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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