R Observatory: Metrics for quadrupen version 1.1-0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

quadrupen

1.1-0Package record

Sparse and Group Sparse Linear Models

0packages depend

5Kdownloads / year

0.2%test coverage

13/13flavors OK

Overview

About

Maintained by Julien ChiquetCRAN page ↗GitHub ↗Website ↗Issues ↗

Fits the solution paths of classical sparse regression models with efficient active set algorithms by solving small sub-problems. Include LASSO, SCAD, MCP, (Sparse) Group-LASSO, Cooperative-LASSO, (Group) LAVA, (Generalized) Fused-Lasso and (Generalized) Elastic-Net. Also provides methods for model selection purpose (information criteria, cross-validation, stability selection).

Changes in 1.1-0

performance
active set: no reallocation of the Gram matrices when variables enter or leave the model, LAPACK triangular solves, in-place Cholesky downdates
several variables (or groups) activated at once in the working set algorithm (new control option maxadd, default 10 for sparse models and 5 for group models)
proximal solvers: adaptive restart of FISTA, safer Lipschitz constant (Lanczos), step-invariant stopping rule and safeguarded Anderson acceleration for PGD
exact block coordinate descent with Newton steps for the quadra method of group models
ridge and lava: no p x p algebra for a diagonal structuring matrix (the default)
faster information criteria; cross-validation folds built on demand (less memory)
typical speed-ups over 1.0-0 with default settings: x2 to x4 for lasso, MCP and SCAD, x5 to x15 for group models, x9 to x36 for elastic-net and sparse designs with large active sets, x8 for ridge and x30 for lava with p = 8000; all lambdas now converge on these cases
bug fixes (results may change)
robustness when the active set exceeds the rank of the design (no more failure of the Cholesky factorization or of the direct solve)
bounded_reg() with method = "quadra" (the default) stopped too early and could return suboptimal solutions; the optimality gap is now computed from the exact KKT conditions

Show all changes in 1.1-0Hide the rest of the changes in 1.1-0

l1/linf group penalty: wrong proximal operator when the group lies in the l1 ball (fista and pgd converged to wrong solutions)
quadra method for group models: exact solution of each block; sparse-group, coop and l1/linf variants now converge
proximal solvers could stop after one iteration on badly scaled data
convergence status now reflects the final optimality gap
the Lipschitz constant estimation no longer draws from R's random number generator
minor updates
objects are rebuilt when a C++ header changes; ARMA_NO_DEBUG also on Windows

From NEWS.md in the release

Install

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

install.packages("quadrupen", 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("jchiquet/quadrupen")

Development version from jchiquet/quadrupen. 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-quadrupen

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-quadrupen

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-quadrupen

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: 15.8 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-06-09
ERROR12 OK, 1 ERROR2026-06-08
OK12 OK2026-04-25

Show 3 earlier changesHide 3 earlier changes

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 1.1-0

READMEYes · 1,158 wordsVignettesYes · 4 · dynamicNEWSYes · 100% structured · mentions 1.1-0Citation fileYes · cites a publicationWebsiteYes · pkgdown

Help pages: 31 (1 internal)includes a package overview page
Examples that run: 58%7 run in a plain check · 5 never run
Exported functions with examples: 52%
Documented parameters: 67%
Return-value docs: 48%
Help pages citing references: 19%

Also includes 3 demo scripts (run with demo())

Vignettes (4)

How these are measured

Downloads

5K

CRAN downloads in the past year

Rank #5,313 · ~14/day · ~416/mo

Releases R versions

Daily download trend is not available in this view yet.

62830 days

1.5K90 days

5K1 year

Compare downloads with other packages →

Also on400 r2u1 autocran

How downloads are counted

Repository

jchiquet/quadrupen ↗Account: jchiquet

1Stars

0Forks

0Open issues

0Open PRs

2Releases

311Commits

1Commit identities

License file reads as GPL-3.0 · 311 commits · Last activity 2026-09-17

Responsiveness

How these are sampled

PRs merged (all time): 100%
Median days to close, 50 most recently updated closed issues: 112
Median days to close, 50 most recently updated closed PRs: 0

Stars over time

2019-07-03 · 12026-07-07 · 1

How these are measured

PracticesBeta

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

Checks run against github.com/jchiquet/quadrupen 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.qmdpkgdown

GitHub Pages site last deployed 2026-09-17 · The repository has a site deploy workflow

pkgdown site last built 2026-09-17

CRAN release process (2)

cran-comments.mdCRAN-SUBMISSION

Lint, format, editor (1)

RStudio project

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

AI coding toolsBeta

This repository shows signs of AI coding tools.

Claude Codefirst seen 2026-04-24
Named in .Rbuildignore: .claude
Pull request it wrote: opened by a project member
Commits: at least 21 crediting it in the message

Models named in its commits

Claude Opus 514 commits · Sep 2026
Claude Sonnet 57 commits · Sep 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

19 external dependencies (excludes base and recommended)

Installing quadrupen adds 31 packages (17 with compiled code, 31 MB of source tarballs). Heaviest: stringi 11 MB, ggplot2 6.0 MB, Rcpp 1.8 MB.

Depends (1)

R >= 4.1.0

Imports (12)

dplyr ggplot2gridMatrixmethodsparallelR6 Rcpp rlang scales tidyr lifecycle

LinkingTo (2)

Rcpp RcppArmadillo

Suggests (10)

elasticnet glmnet igraph knitr larsMASSncvreg grpreg rmarkdown testthat

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)

Julien Chiquet

Author, Maintainer since 0.1-0 (2012)

Releases (17)

Pick two releases to compare their code metrics.

1.1-0Latest
record
2026-09-17 · current release · diff ↗
1.0-0
record
2026-06-05 · diff ↗ ·
removed 1 export
crossval

added 32 exports
BoundedRegressionFit, CrossValidation, DataModel, FusedLassoFit, GroupLavaFit, InformationCriteria, LavaFit, QuadrupenFit, RidgeRegressionFit, SparseFit, SparseGroupFit, StabilityPath, bounded_reg, coop_lasso, criteria, cross_validate, elastic_net, fused_lasso, group_l1linf, group_lasso, group_lava, group_sparse_lm, lasso, lava, mcp, ridge, scad, selection, sparse_coop_lasso, sparse_group_l1linf and 2 more
R
R 4.6.0 released · 2026-04-24
0.2-13
record
2025-10-09 · diff ↗
R
R 4.5.0 released · 2025-04-11
0.2-12
record
2024-06-25 · diff ↗
R
R 4.4.0 released · 2024-04-24
0.2-11
record
2023-12-18 · diff ↗
R
R 4.3.0 released · 2023-04-21
0.2-10
record
2023-01-16 · diff ↗
0.2-9
record
2022-08-25 · diff ↗
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
unarchivedReturned to CRAN
2020-11-18
0.2-8
record
2020-11-18 · diff ↗
archivedRemoved from CRAN
2020-11-03
check problems were not corrected in time

Show 18 earlier eventsHide 18 earlier events

R
R 4.0.0 released · 2020-04-24
0.2-7
record
2019-08-28 · diff ↗
R
R 3.6.0 released · 2019-04-26
0.2-6
record
2018-04-30 · diff ↗
R
R 3.5.0 released · 2018-04-23
R
R 3.4.0 released · 2017-04-21
0.2-5
record
2017-03-07 · diff ↗
R
R 3.3.0 released · 2016-05-03
R
R 3.2.0 released · 2015-04-16
R
R 3.1.0 released · 2014-04-10
0.2-4
record
2014-01-16 · diff ↗
0.2-3
record
2013-09-30 · diff ↗
0.2-2
record
2013-04-08 · diff ↗
R
R 3.0.0 released · 2013-04-03
0.2-1
record
2013-02-27 · diff ↗
0.2-0
record
2013-02-26 · diff ↗ ·
added 1 export
bounded.reg
0.1-0
record
2012-10-10
R
R 2.15.0 released · 2012-03-30

Package metadata

First published: 2012-10-10
Total releases: 17 / 14 yrs
License: GPL (>= 3) OSI
Minimum R: ≥ 4.1.0
Download size: 7.9 MB

Cite

Cite this package

Run in R for the authors' entry:

citation("quadrupen")

The package provides a citation file, so citation() returns the authors' own entry.

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 quadrupen version 1.1-0 [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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