[Planeshifter]

Resolves #3872.

Description

What is the purpose of this pull request?

This pull request:

• adds a C implementation and Node-API native addon for @stdlib/stats/base/dists/t/logcdf, including C headers, GYP/Makefile build configurations, JavaScript/C benchmarks and examples, native unit tests, and README documentation updates. The implementation is a faithful port of the JavaScript implementation, preserving parameter validation, endpoint behavior, NaN/infinity handling, and the incomplete-beta branch selection and tail-specific formulas (log1p for the positive tail, direct logarithms for the negative tail).

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: add C implementations for F and Student's t CDFs metr-issue-tracker#1226

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

• Native tests assert against the existing Julia fixtures using isAlmostSameValue with measured minimum ULP bounds (per RFC [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352 practice).

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

This PR was written primarily by Claude Code, using the merged stats/base/dists/beta/cdf and beta/logcdf C implementations as templates; the changes were validated locally (native addon built, all native tests passing, ULP bounds measured) before submission.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/t/logcdf	$\\color{green}309/309$ $\\color{green}+0.00\\%$	$\\color{green}31/31$ $\\color{green}+0.00\\%$	$\\color{green}4/4$ $\\color{green}+0.00\\%$	$\\color{green}309/309$ $\\color{green}+0.00\\%$

The above coverage report was generated for the changes in this PR.

[stdlib-bot]

Hello! 👋

We've noticed that you've been opening a number of PRs addressing good first issues. Thank you for your interest and enthusiasm!

Now that you've made a few contributions, we suggest no longer working on good first issues. Instead, we encourage you to prioritize cleaning up any PRs which have yet to be merged and then proceed to work on more involved tasks.

Not only does this ensure that other new contributors can work on things and get ramped up on all things stdlib, it also ensures that you can spend your time on more challenging problems. 🚀

For ideas for future PRs, feel free to search the codebase for TODOs and FIXMEs and be sure to check out other open issues on the issue tracker. Cheers!

[anandkaranubc]

Ready to merge, @Planeshifter