feat: add C implementation for math/base/special/gamma-delta-ratio

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds C implementation for math/base/special/gamma-delta-ratio.
• replaces a variable declared in main.js for MAX_FACTORIAL, by importing it.

double stdlib_base_gamma_delta_ratio( const double z, const double delta );

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves a part of [RFC]: Add C implementations to base special math functions (tracking issue) #649.

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.

No.

Checklist

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

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[gunjjoshi]

For packages like these, in order to compare the older and latest boost implementations, we'll have to go through the whole implementations ( which are quite large ). Is there any other way of comparing them, or we should check everything line by line?

[kgryte]

@gunjjoshi 1) You should be consulting the Boost GitHub repo when examining implementations: https://github.com/boostorg/math/blob/develop/include/boost/math/special_functions/gamma.hpp. 2) Using the repo, you can perform a diff between the two Boost versions for the implementation in question. Based on commit history and diff, you can determine whether the implementation has changed. If it has changed, then you need to determine which lines have changed and whether we need to make any updates.

[kgryte]

In short, use the tools available to you to simplify the R&D. 🙂

[gunjjoshi]

@kgryte I found the difference here, and it doesn't seem there is any change in the implementation for gamma-delta-ratio. So, I've updated the links in main.c and main.js.

[kgryte]

@gunjjoshi instead of using the GitHub UI, in the future, I suggest cloning the Boost repo and doing the diff locally, that way you can do a diff on only the file in question.

[Planeshifter]

Let's land this one! 🚀