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feat: add C implementation for math/base/special/gammainc #7408

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Progresses #649

Description

What is the purpose of this pull request?

This pull request:

  • Adds the complete C implementation of gammainc, along with updated benchmarks and examples.

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This pull request:

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

@stdlib-js/reviewers

@anandkaranubc
feat: temp commit
d24f74f
@anandkaranubc
Merge branch 'develop' into feat/gammainc
b55983d
@anandkaranubc
feat: temp commit
a225e46
@anandkaranubc
Merge branch 'develop' into feat/gammainc
c263025
@anandkaranubc
feat: add C implementation for math/base/special/gammainc
8cc8e26 
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@anandkaranubc
Merge branch 'develop' into feat/gammainc
dcbd012
@stdlib-bot stdlib-bot added Math Issue or pull request specific to math functionality. Needs Review A pull request which needs code review. labels Jun 19, 2025
@anandkaranubc
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/stdlib update-copyright-years

@stdlib-bot stdlib-bot added the bot: In Progress Pull request is currently awaiting automation. label Jun 19, 2025
@stdlib-bot stdlib-bot removed the bot: In Progress Pull request is currently awaiting automation. label Jun 19, 2025
@anandkaranubc anandkaranubc added C Issue involves or relates to C. GSoC Google Summer of Code. gsoc: 2025 Google Summer of Code (2025). labels Jun 19, 2025
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stdlib-bot commented Jun 19, 2025 •
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Coverage Report

Package Statements Branches Functions Lines
math/base/special/gammainc $\color{red}1526/1755$
$\color{green}+86.95\%$ 		$\color{red}106/140$
$\color{green}+75.71\%$ 		$\color{red}20/24$
$\color{green}+83.33\%$ 		$\color{red}1526/1755$
$\color{green}+86.95\%$

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

@anandkaranubc
bench: shorten the interval for input values
cc28656 
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@anandkaranubc
chore: add scripts
f052817 
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@anandkaranubc
Merge branch 'develop' into feat/gammainc-c
0265fb5
@Planeshifter Planeshifter self-requested a review June 20, 2025 20:03
@anandkaranubc
fix: use correct equation
474b103 
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@anandkaranubc
test: add more tests
d79211e
@anandkaranubc
Merge branch 'develop' into feat/gammainc-c
e1c5923
@anandkaranubc
Merge branch 'develop' into feat/gammainc-c
ce37e13
@anandkaranubc
test: use ulpdiff for tests
bf5c3bc 
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test: fix ulp difference
d27d06c 
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test: use appropriate filenames for clarity
c9f071c 
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test: add more tests
effecca 
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anandkaranubc
anandkaranubc commented Jun 21, 2025
View reviewed changes
lib/node_modules/@stdlib/math/base/special/gammainc/test/test.native.js
Comment on lines +46 to +47
// TODO: Add this to `test.js` once the JS implementation matches the latest Boost C++ implementation.
var largeXLargeS = require( './fixtures/cpp/large_x_large_s.json' );
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The CI is failing because of this.

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The JS implementation needs to be updated first in order to properly account for all the expected values in this fixture.

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New test coverage is 89.34%

@anandkaranubc
test: add comment explaining large differences
24a88ab 
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