feat: add `math/base/special/fast/atanhf` #9046

nakul-krishnakumar · 2025-12-14T20:01:33Z

type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes. report:

task: lint_filenames status: passed
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task: lint_license_headers status: passed ---

Resolves a part of #649 .

Description

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This pull request:

Adds math/base/special/fast/atanhf.

Related Issues

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This pull request has the following related issues:

[RFC]: Add C implementations to base special math functions (tracking issue) #649

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No.

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Read, understood, and followed the contributing guidelines.

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nakul-krishnakumar · 2025-12-14T20:02:35Z

/stdlib update-copyright-years

stdlib-bot · 2025-12-14T20:03:44Z

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/fast/atanhf	$\color{green}188/188$ $\color{green}+0.00%$	$\color{green}10/10$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}188/188$ $\color{green}+0.00%$

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

gunjjoshi · 2025-12-31T05:49:58Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/README.md

+
+```c
+float out = stdlib_base_fast_atanhf( 0.0f );
+// returns 0.0


Suggested change

// returns 0.0

// returns 0.0f

gunjjoshi · 2025-12-31T05:50:09Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/README.md

+// returns 0.0
+
+out = stdlib_base_fast_atanhf( -0.0f );
+// returns -0.0


Suggested change

// returns -0.0

// returns -0.0f

gunjjoshi · 2025-12-31T06:06:37Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/examples/c/example.c

+	int i;
+
+	for ( i = 0; i < 100; i++ ) {
+		x = ( (float)rand() / (float)RAND_MAX ) * 100.0f;


@nakul-krishnakumar The domain of atanhf is restricted to [-1.0, 1.0]. But here, you are generating example values in the [0, 100) domain. We'll need to change this. You can do something like this: https://github.com/stdlib-js/stdlib/blob/develop/lib/node_modules/%40stdlib/math/base/special/fast/atanh/examples/c/example.c

Thank you for the review, I will update as suggested! @gunjjoshi

gunjjoshi · 2025-12-31T06:08:27Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/README.md

+    int i;
+
+    for ( i = 0; i < 100; i++ ) {
+        x = ( (float)rand() / (float)RAND_MAX ) * 100.0f;


Same comment regarding the domain of atanhf.

gunjjoshi · 2025-12-31T06:14:55Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/benchmark/c/native/benchmark.c

+	int i;
+
+	for ( i = 0; i < 100; i++ ) {
+		x[ i ] = random_uniform( 0.0f, 100.0f );


Same thing here. We must generate values between [-1.0, 1.0].

gunjjoshi · 2025-12-31T06:15:59Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/test/test.native.js

+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
+var randu = require( '@stdlib/random/base/randu' );
+var ulpdiff = require( '@stdlib/number/float32/base/ulp-difference' );
+var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zero' );


Suggested change

var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zero' );

var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );

gunjjoshi · 2025-12-31T06:17:21Z

lib/node_modules/@stdlib/math/base/special/fast/atanhf/package.json

+{
+  "name": "@stdlib/math/base/special/fast/atanhf",
+  "version": "0.0.0",
+  "description": "Compute the hyperbolic arctangent of single-precision floating-point number.",


Suggested change

"description": "Compute the hyperbolic arctangent of single-precision floating-point number.",

"description": "Compute the hyperbolic arctangent of a single-precision floating-point number.",

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nakul-krishnakumar · 2026-01-01T17:15:05Z

@gunjjoshi Thank you for the review! I have made all the requested changes.

nakul-krishnakumar · 2026-01-01T17:15:41Z

/stdlib update-copyright-years

lib/node_modules/@stdlib/math/base/special/fast/atanhf/benchmark/c/native/benchmark.c

Signed-off-by: Nakul Krishnakumar <[email protected]>

kgryte · 2026-01-05T23:30:53Z

/stdlib merge

lib/node_modules/@stdlib/math/base/special/fast/atanhf/benchmark/benchmark.js

lib/node_modules/@stdlib/math/base/special/fast/atanhf/benchmark/benchmark.native.js

Signed-off-by: Philipp Burckhardt <[email protected]>

Planeshifter

PR is in great shape now, thank you @nakul-krishnakumar and @gunjjoshi for reviews!

stdlib-bot · 2026-01-07T05:44:11Z

PR Commit Message

feat: add `math/base/special/fast/atanhf`

PR-URL: https://github.com/stdlib-js/stdlib/pull/9046
Ref: https://github.com/stdlib-js/stdlib/issues/649

Co-authored-by: Philipp Burckhardt <[email protected]>
Co-authored-by: stdlib-bot <[email protected]>
Reviewed-by: Philipp Burckhardt <[email protected]>
Reviewed-by: Gunj Joshi <[email protected]>
Signed-off-by: Nakul Krishnakumar <[email protected]>
Signed-off-by: Philipp Burckhardt <[email protected]>

Please review the above commit message and make any necessary adjustments.

⚠️ Action Required: This PR references tracking issues. Please update the PR description to replace any "Closes", "Fixes", or "Resolves" keywords with "Ref" when referencing these issues.

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Merge remote-tracking branch 'upstream/develop' into fast-atanhf

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	var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zero' );
	var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );

	"description": "Compute the hyperbolic arctangent of single-precision floating-point number.",
	"description": "Compute the hyperbolic arctangent of a single-precision floating-point number.",

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