Matthew Fidler

Also published as Matthew L Fidler, Matthew L. Fidler

28 packages On CRAN since Mar 2017 (9 years) · last active 9 days ago 0000-0001-8538-6691

R-Universe CRAN Search

Downloads

27.4K

Last 30 days

72.2K

Last 90 days

291.7K

Last year

Average trend: +121.7% (30d vs prior 30d)

Top Packages by Downloads

lbfgsb3c

5.8K

rxode2

3.9K

lotri

2.7K

rxode2ll

2.7K

dparser

2.6K

nlmixr2est

2.4K

xgxr

PreciseSums

nlmixr2extra

1.8K

nlmixr2plot

1.8K

Portfolio Check Status

Aggregate CRAN check results across 18 maintained packages.

NOTE

226

Recent Activity

babelmixr2 updated v0.1.12 Oct 16, 2026

Use 'nlmixr2' to Interact with Open Source and Commercial Software

nlmixr2plot updated v5.2.1 Oct 16, 2026

Nonlinear Mixed Effects Models in Population PK/PD, Plot Functions

nlmixr2est updated v7.2.1 Oct 14, 2026

Nonlinear Mixed Effects Models in Population PK/PD, Estimation Routines

nonmem2rx updated v0.1.12 Oct 14, 2026

Converts 'NONMEM' Models to 'rxode2'

nlmixr2est updated v7.2.0 Oct 13, 2026

Nonlinear Mixed Effects Models in Population PK/PD, Estimation Routines

rxode2 updated v5.1.8 Oct 13, 2026

Facilities for Simulating from ODE-Based Models

dparser updated v1.3.1-14 Oct 12, 2026

Port of 'Dparser' Package

lbfgsb3c updated v2026-3.5 Oct 6, 2026

Limited Memory BFGS Minimizer with Bounds on Parameters with optim() 'C' Interface

nlmixr2scm updated v0.4.1 Sep 30, 2026

Stepwise Covariate Modeling for 'nlmixr2' Models

rxode2 updated v5.1.7.1 Sep 29, 2026

Facilities for Simulating from ODE-Based Models

Maintained Packages

18 packages

Package	Title	Downloads	Version
lbfgsb3c 5.8K downloads/30d	Limited Memory BFGS Minimizer with Bounds on Parameters with optim() 'C' Interface	5.8K	2026-3.5
rxode2 3.9K downloads/30d	Facilities for Simulating from ODE-Based Models	3.9K	5.1.8
lotri 2.7K downloads/30d	A Simple Way to Specify Symmetric, Block Diagonal Matrices	2.7K	1.0.5
rxode2ll 2.7K downloads/30d	Log-Likelihood Functions for 'rxode2'	2.7K	2.0.18
dparser 2.6K downloads/30d	Port of 'Dparser' Package	2.6K	1.3.1-14
nlmixr2est 2.4K downloads/30d	Nonlinear Mixed Effects Models in Population PK/PD, Estimation Routines	2.4K	7.2.1
PreciseSums 2K downloads/30d	Accurate Floating Point Sums and Products	2K	0.7
nlmixr2extra 1.8K downloads/30d	Nonlinear Mixed Effects Models in Population PK/PD, Extra Support Functions	1.8K	5.2.1
nlmixr2plot 1.8K downloads/30d	Nonlinear Mixed Effects Models in Population PK/PD, Plot Functions	1.8K	5.2.1
nlmixr2 1.7K downloads/30d	Nonlinear Mixed Effects Models in Population PK/PD	1.7K	7.0.1
nlmixr2save 1.6K downloads/30d	Save 'nlmixr2' Fits in a Format Readable Outside 'nlmixr2'	1.6K	0.2.1
nlmixr2data 1.4K downloads/30d	Nonlinear Mixed Effects Models in Population PK/PD, Data	1.4K	2.0.10
n1qn1 1.3K downloads/30d	Port of the 'Scilab' 'n1qn1' Module for Unconstrained BFGS Optimization	1.3K	6.0.1-14
RcppTrust 1.2K downloads/30d	Thread-Safe C++ Port of the 'trust' Trust Region Optimizer	1.2K	0.1.0
rxode2lincmt 1.2K downloads/30d	Linear Compartment Model Solutions and Gradients for 'rxode2'	1.2K	0.1.0
nonmem2rx 1.1K downloads/30d	Converts 'NONMEM' Models to 'rxode2'	1.1K	0.1.12
babelmixr2 825 downloads/30d	Use 'nlmixr2' to Interact with Open Source and Commercial Software	825	0.1.12
monolix2rx 485 downloads/30d	Converts 'Monolix' Models to 'rxode2'	485	0.0.6

Co-authored Packages

5 packages

Package	Title	Downloads	Version
ggPMX 1.6K downloads/30d	'ggplot2' Based Tool to Facilitate Diagnostic Plots for NLME Models	1.6K	1.3.2
xpose.nlmixr2 634 downloads/30d	Graphical Diagnostics for Pharmacometric Models: Extension to 'nlmixr2'	634	0.4.2
nlmixr2lib 566 downloads/30d	A Model Library for 'nlmixr2'	566	0.3.2
nlmixr2scm 433 downloads/30d	Stepwise Covariate Modeling for 'nlmixr2' Models	433	0.4.1
nlmixr2utils 259 downloads/30d	Shared Infrastructure for 'nlmixr2' Extension Packages	259	0.3.1

Contributions

5 packages

Package	Title	Downloads	Version
xgxr 2K downloads/30d	Exploratory Graphics for Pharmacometrics	2K	1.1.6
posologyr 508 downloads/30d	Individual Dose Optimization using Population Pharmacokinetics	508	1.2.8
pmxNODE 494 downloads/30d	Application of NODEs in 'Monolix', 'NONMEM', and 'nlmixr2'	494	0.2.1
nlmixr2auto 412 downloads/30d	Automated Population Pharmacokinetic Modeling	412	1.0.0
nlmixr2autoinit 401 downloads/30d	Automatic Generation of Initial Estimates for Population Pharmacokinetic Modeling	401	1.0.1

Package repositories

Repositories of packages Matthew Fidler maintains where an AI coding tool was found. Other people commit to these repositories too, so each line describes the repository, not Matthew Fidler's own work.

nlmixr2/babelmixr2 ↗(organization: nlmixr2)
Packages: babelmixr2
- Claude Codefirst seen 2026-04-02
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 41 crediting it in the message
- Claude Code
  Pull requests: 1 from outside contributors, first on 2026-06-18
nlmixr2/dparser-R ↗(organization: nlmixr2)
Packages: dparser
- Claude Codefirst seen 2026-05-02
  Pull request it wrote: opened by a project member
  Commits: at least 8 crediting it in the message
- GitHub Copilotfirst seen 2026-05-04
  Commits: 1 by its own account
nlmixr2/lbfgsb3c ↗(organization: nlmixr2)
Packages: lbfgsb3c
- Claude Codefirst seen 2026-08-27
  Pull request it wrote: opened by a project member
  Commits: at least 1 crediting it in the message
nlmixr2/lotri ↗(organization: nlmixr2)
Packages: lotri
- Antigravityfirst seen 2026-05-13
  Named in .Rbuildignore: .antigravity
- Claude Codefirst seen 2026-04-02
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 5 crediting it in the message
- GitHub Copilotfirst seen 2026-04-03
  Commits: 1 by its own account
- Claude Code
  Pull requests: 1 from outside contributors, first on 2026-06-15
nlmixr2/monolix2rx ↗(organization: nlmixr2)
Packages: monolix2rx
- Claude Codefirst seen 2026-04-02
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Named in .gitignore: .claude
  Pull request it wrote: opened by a project member
  Commits: at least 33 crediting it in the message
- GitHub Copilotfirst seen 2026-08-12
  Commits: at least 2 crediting it in the message
- Claude Code
  Pull requests: 1 from outside contributors, first on 2026-06-15
nlmixr2/n1qn1c ↗(organization: nlmixr2)
Packages: n1qn1
- Claude Codefirst seen 2026-04-02
  Named in .Rbuildignore: .claude
  Pull request it wrote: opened by a project member
  Commits: at least 18 crediting it in the message
nlmixr2/nlmixr2 ↗(organization: nlmixr2)
Packages: nlmixr2
- Claude Codefirst seen 2026-07-08
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 64 crediting it in the message
nlmixr2/nlmixr2data ↗(organization: nlmixr2)
Packages: nlmixr2data
- Claude Codefirst seen 2026-07-10
  Pull request it wrote: opened by a project member
  Commits: at least 3 crediting it in the message
nlmixr2/nlmixr2est ↗(organization: nlmixr2)
Packages: nlmixr2est
- Antigravityfirst seen 2026-05-13
  Named in .Rbuildignore: .antigravity
  Named in .gitignore: .antigravity
- Augment Codefirst seen 2026-05-30
  Named in .Rbuildignore: .augment
  Named in .gitignore: .augment
- Claude Codefirst seen 2026-03-27
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Named in .gitignore: .claude
  Pull request it wrote: opened by a project member
  Commits: at least 1,631 crediting it in the message
- Continuefirst seen 2026-05-30
  Named in .Rbuildignore: .continue
  Named in .gitignore: .continue
- Cursorfirst seen 2026-07-01
  Named in .gitignore: .cursor
- GitHub Copilotfirst seen 2025-12-06
  Seen in the repository: .github/copilot-instructions.md
  Pull request: opened by its own account
  Commits: 25 by its own account · at least 4 crediting it in the message
- Kilo Codefirst seen 2026-05-30
  Named in .Rbuildignore: .kilocode
  Named in .gitignore: .kilocode
- Kiro, Amazon Q's successorfirst seen 2026-05-30
  Named in .Rbuildignore: .kiro
  Named in .gitignore: .kiro
- Windsurf, now Devin Desktopfirst seen 2026-05-30
  Named in .Rbuildignore: .windsurf
  Named in .gitignore: .windsurf
- Claude Code
  Pull requests: 50 from outside contributors, first on 2026-06-08, 6 from forks
nlmixr2/nlmixr2extra ↗(organization: nlmixr2)
Packages: nlmixr2extra
- Claude Codefirst seen 2026-04-03
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 22 crediting it in the message
- Claude Code
  Pull requests: 1 from outside contributors, first on 2026-09-30
nlmixr2/nlmixr2plot ↗(organization: nlmixr2)
Packages: nlmixr2plot
- Claude Codefirst seen 2026-05-27
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 36 crediting it in the message
- GitHub Copilotfirst seen 2026-02-27
  Pull request: opened by its own account
  Commits: 2 by its own account
nlmixr2/nlmixr2save ↗(organization: nlmixr2)
Packages: nlmixr2save
- Claude Codefirst seen 2026-07-14
  Pull request it wrote: opened by a project member
  Commits: at least 31 crediting it in the message
- GitHub Copilotfirst seen 2026-03-25
  Pull request: opened by its own account
  Commits: 3 by its own account
nlmixr2/nonmem2rx ↗(organization: nlmixr2)
Packages: nonmem2rx
- Claude Codefirst seen 2026-05-01
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 62 crediting it in the message
- Claude Code
  Pull requests: 4 from outside contributors, first on 2026-06-15
nlmixr2/PreciseSums ↗(organization: nlmixr2)
Packages: PreciseSums
- Claude Codefirst seen 2026-08-27
  Pull request it wrote: opened by a project member
  Commits: at least 1 crediting it in the message
nlmixr2/RcppTrust ↗(organization: nlmixr2)
Packages: RcppTrust
- Claude Codefirst seen 2026-10-14
  Pull request it wrote: opened by a project member
nlmixr2/rxode2 ↗(organization: nlmixr2)
Packages: rxode2
- Antigravityfirst seen 2026-05-13
  Named in .Rbuildignore: .antigravity
- Claude Codefirst seen 2026-03-01
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, .mcp.json, CLAUDE.md
  Named in .gitignore: .claude, .mcp.json
  Pull request it wrote: opened by a project member
  Commits: 1 by its own account · at least 641 crediting it in the message
- Gemini CLIfirst seen 2026-05-07
  Named in .Rbuildignore: .gemini
- GitHub Copilotfirst seen 2025-11-16
  Seen in the repository: .github/copilot-instructions.md
  Pull request: opened by its own account
  Commits: 27 by its own account · at least 80 crediting it in the message
- Claude Code
  Pull requests: 38 from outside contributors, first on 2026-06-10, 2 from forks
nlmixr2/rxode2lincmt ↗(organization: nlmixr2)
Packages: rxode2lincmt
- Claude Codefirst seen on or before 2026-09-14
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 1 crediting it in the message
nlmixr2/rxode2ll ↗(organization: nlmixr2)
Packages: rxode2ll
- Claude Codefirst seen 2026-04-02
  Seen in the repository: CLAUDE.md
  Named in .Rbuildignore: .claude, CLAUDE.md
  Pull request it wrote: opened by a project member
  Commits: at least 7 crediting it in the message
- Claude Code
  Pull requests: 1 from outside contributors, first on 2026-06-18

Finding nothing does not mean no tool was used. How this is detected.

Roles

Maintains 18

Co-authors 5

Contributes 5

Impact

packages depend on their work

dependency h-index

packages with 10+ dependents

Most depended on

rxode2 19 deps

nlmixr2est 14 deps

lotri 8 deps

Frequent Collaborators

Bill Denney 10 pkgs

Justin Wilkins 6 pkgs

Wenping Wang 6 pkgs

Vipul Mann 5 pkgs

Christian Bartels 4 pkgs

Matthew L. Fidler 4 pkgs

Richard Hooijmaijers 3 pkgs

Rik Schoemaker 3 pkgs

+2 more

View collaborator network →

Career

On CRAN since Mar 2017 (9 years) · last active 9 days ago

Links

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