feat: add C implementation for stats/base/dists/lognormal/cdf

[rautelaKamal]

Description

What is the purpose of this pull request?

This pull request:

• Adds a C implementation for evaluating the cumulative distribution function (CDF) of a lognormal distribution (@stdlib/stats/base/dists/lognormal/cdf). The implementation delegates to the native stdlib_base_dists_normal_cdf function after log-transforming the input x, adhering to the modular C core approach.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #3747

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.

AI Assistance Disclosure

• Yes
• No

If yes, how was AI used?
I used an AI to speed up the translation of JS tests to native tests using the Julia fixtures, and to stub out the required C files (addon.c, main.c, build configs). The generated code was then verified against project style guidelines.

Checklist

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

• Read, understood, and followed the contributing guidelines.

[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.

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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!

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/lognormal/cdf	$\color{green}276/276$ $\color{green}+0.00%$	$\color{green}23/23$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{green}276/276$ $\color{green}+0.00%$

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

[kgryte]

You are missing all the Doxygen comments. https://github.com/stdlib-js/stdlib/blob/develop/tools/snippets/benchmark/c/benchmark.c

[rautelaKamal]

I've addressed the feedback in the latest push (added Doxygen comments, migrated to the new RNG, and updated isAlmostSameValue usage). This PR should be ready for re-review.

[kgryte]

You should go ahead and migrate to using isAlmostSameValue for ULP-based difference testing.

[kgryte]

@rautelaKamal I updated your PR title. Would you mind updating your other PR titles similarly? This reduces the amount of busy work required from maintainers. Cheers!

[rautelaKamal]

I have updated the PR titles as requested and addressed the feedback regarding isAlmostSameValue, Doxygen, and RNG migration. This PR is now ready for re-review.

[Planeshifter]

Thank you for your work on this C implementation, @rautelaKamal, and apologies for the duplicated effort here.

We have two open PRs adding a C implementation for stats/base/dists/lognormal/cdf: this one and #10809. Since only one can land, we're going to move forward with #10809, which was opened a few days earlier (March 8) and has since been kept current. The two implementations are essentially equivalent in their numerical kernel; #10809 additionally aligns its benchmark input ranges with the JS benchmark and migrates the existing JS tests to the isAlmostSameValue convention.

Closing this in favor of #10809. This is no reflection on the quality of your work — it's purely a matter of de-duplicating two parallel efforts. Thanks again for contributing, and we'd welcome your help on other distribution ports.