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CHANGELOG.md

@@ -4,7 +4,7 @@
 
 <section class="release" id="unreleased">
 
-## Unreleased (2024-08-31)
+## Unreleased (2024-09-02)
 
 <section class="packages">
 
@@ -76,6 +76,28 @@
 
 <!-- /.package -->
 
+<section class="package" id="math-base-special-aversinf-unreleased">
+
+#### [@stdlib/math/base/special/aversinf](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/aversinf)
+
+<details>
+
+<section class="features">
+
+##### Features
+
+-   [`4bddc16`](https://github.com/stdlib-js/stdlib/commit/4bddc16dfcdc4d18a95bbd08abc869f58d77396b) - add `math/base/special/aversinf` [(#2852)](https://github.com/stdlib-js/stdlib/pull/2852)
+
+</section>
+
+<!-- /.features -->
+
+</details>
+
+</section>
+
+<!-- /.package -->
+
 <section class="package" id="math-base-special-ldexpf-unreleased">
 
 #### [@stdlib/math/base/special/ldexpf](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/ldexpf)
@@ -254,6 +276,7 @@ A total of 3 people contributed to this release. Thank you to the following cont
 
 <details>
 
+-   [`4bddc16`](https://github.com/stdlib-js/stdlib/commit/4bddc16dfcdc4d18a95bbd08abc869f58d77396b) - **feat:** add `math/base/special/aversinf` [(#2852)](https://github.com/stdlib-js/stdlib/pull/2852) _(by Gunj Joshi)_
 -   [`ff629c7`](https://github.com/stdlib-js/stdlib/commit/ff629c760ef40d9245a87a56716ea7a12145f6b2) - **feat:** add `math/base/special/maxabsf` _(by Gunj Joshi, Philipp Burckhardt)_
 -   [`6b76aa9`](https://github.com/stdlib-js/stdlib/commit/6b76aa904c33cbe3f3c28b61ae7797e444d13e52) - **feat:** add `math/base/special/avercosf` [(#2846)](https://github.com/stdlib-js/stdlib/pull/2846) _(by Gunj Joshi)_
 -   [`f65c856`](https://github.com/stdlib-js/stdlib/commit/f65c8563ab3b3a25883d020332f4a594aa69892a) - **refactor:** use stdlib `fmod` and `DDD_D` napi function in `math/base/special/wrap` [(#2814)](https://github.com/stdlib-js/stdlib/pull/2814) _(by Gunj Joshi)_

base/special/aversinf/README.md

@@ -0,0 +1,215 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# Arcversinef
+
+> Compute the [inverse versed sine][inverse-versed-sine] of a single-precision floating-point number (in radians).
+
+<section class="intro">
+
+The [inverse versed sine][inverse-versed-sine] is defined as
+
+<!-- <equation class="equation" label="eq:arcversine" align="center" raw="\operatorname{aversinf}(\theta) = \arccos(1-\theta)" alt="Inverse versed sine."> -->
+
+```math
+\mathop{\mathrm{aversinf}}(\theta) = \arccos(1-\theta)
+```
+
+<!-- </equation> -->
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var aversinf = require( '@stdlib/math/base/special/aversinf' );
+```
+
+#### aversinf( x )
+
+Computes the [inverse versed sine][inverse-versed-sine] of a single-precision floating-point number (in radians).
+
+```javascript
+var v = aversinf( 0.0 );
+// returns 0.0
+
+v = aversinf( 3.141592653589793 / 2.0 );
+// returns ~2.1783
+
+v = aversinf( 3.141592653589793 / 6.0 );
+// returns ~1.0742
+```
+
+If `x < 0`, `x > 2`, or `x` is `NaN`, the function returns `NaN`.
+
+```javascript
+var v = aversinf( -1.0 );
+// returns NaN
+
+v = aversinf( 3.14 );
+// returns NaN
+
+v = aversinf( NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var linspace = require( '@stdlib/array/base/linspace' );
+var aversinf = require( '@stdlib/math/base/special/aversinf' );
+
+var x = linspace( 0.0, 2.0, 100 );
+
+var i;
+for ( i = 0; i < x.length; i++ ) {
+    console.log( aversinf( x[ i ] ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/math/base/special/aversinf.h"
+```
+
+#### stdlib_base_aversinf( x )
+
+Compute the [inverse versed sine][inverse-versed-sine] of a single-precision floating-point number (in radians).
+
+```c
+float out = stdlib_base_aversinf( 3.141592653589793f / 2.0f );
+// returns ~2.1783f
+```
+
+If `x < 0`, `x > 2`, or `x` is `NaN`, the function returns `NaN`.
+
+```c
+float out = stdlib_base_aversinf( 3.141592653589793f );
+// returns NaN
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value.
+
+```c
+float stdlib_base_aversinf( const float x );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/math/base/special/aversinf.h"
+#include <stdio.h>
+
+int main( void ) {
+    const float x[] = { -2.5f, -2.0f, -1.5f, -1.0f, -0.5f, 0.5f, 1.0f, 1.5f, 2.0f, 2.5f };
+
+    float v;
+    int i;
+    for ( i = 0; i < 10; i++ ) {
+        v = stdlib_base_aversinf( x[ i ] );
+        printf( "aversinf(%f) = %f\n", x[ i ], v );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[inverse-versed-sine]: https://en.wikipedia.org/wiki/Versine
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

base/special/aversinf/benchmark/benchmark.js

@@ -0,0 +1,52 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/array/uniform' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var pkg = require( './../package.json' ).name;
+var aversinf = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = randu( 100, 0.0, 2.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = aversinf( x[ i % x.length ] );
+		if ( isnanf( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnanf( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

base/special/aversinf/benchmark/benchmark.native.js

@@ -0,0 +1,61 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/array/uniform' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var aversinf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( aversinf instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = randu( 100, 0.0, 2.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = aversinf( x[ i % x.length ] );
+		if ( isnanf( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnanf( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});