feat: add math/base/special/besselj1f

lib/node_modules/@stdlib/math/base/special/besselj1f/README.md

@@ -0,0 +1,224 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 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.
+
+-->
+
+# j1
+
+> Compute the [Bessel function of the first kind][bessel-first-kind] of order one.
+
+<section class="intro">
+
+The [Bessel function of the first kind][bessel-first-kind] of order one is defined as
+
+<!-- <equation class="equation" label="eq:bessel_first_kind_order_one" align="center" raw="J_1 (x) = \frac{1}{2 \pi} \int_{-\pi}^\pi e^{i(\tau - x \sin(\tau))} \,d\tau" alt="Bessel function of the first kind of order one"> -->
+
+```math
+J_1 (x) = \frac{1}{2 \pi} \int_{-\pi}^\pi e^{i(\tau - x \sin(\tau))} \,d\tau
+```
+
+<!-- <div class="equation" align="center" data-raw-text="J_1 (x) = \frac{1}{2 \pi} \int_{-\pi}^\pi e^{i(\tau - x \sin(\tau))} \,d\tau" data-equation="eq:bessel_first_kind_order_one">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@bb29798906e119fcb2af99e94b60407a270c9b32/lib/node_modules/@stdlib/math/base/special/besselj1f/docs/img/equation_bessel_first_kind_order_one.svg" alt="Bessel function of the first kind of order one">
+    <br>
+</div> -->
+
+<!-- </equation> -->
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var j1 = require( '@stdlib/math/base/special/besselj1f' );
+```
+
+#### j1( x )
+
+Computes the [Bessel function of the first kind][bessel-first-kind] of order one at `x`.
+
+```javascript
+var v = j1( 0.0 );
+// returns 0.0
+
+v = j1( 1.0 );
+// returns ~0.440
+
+v = j1( Infinity );
+// returns 0.0
+
+v = j1( -Infinity );
+// returns 0.0
+
+v = j1( NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var uniform = require( '@stdlib/random/array/uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var besselj1 = require( '@stdlib/math/base/special/besselj1f' );
+
+var opts = {
+    'dtype': 'float32'
+};
+var x = uniform( 100, 0.0, 100.0, opts );
+
+logEachMap( 'besselj1f(%0.4f) = %0.4f', x, besselj1 );
+```
+
+</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/besselj1f.h"
+```
+
+#### stdlib_base_besselj1f( x )
+
+Computes the [Bessel function of the first kind][bessel-first-kind] of order one at `x`.
+
+```c
+double out = stdlib_base_besselj1f( 0.0 );
+// returns 0.0
+
+out = stdlib_base_besselj1f( 1.0 );
+// returns ~0.440
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] double` input value.
+
+```c
+double stdlib_base_besselj1f( const double 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/besselj1f.h"
+#include <stdio.h>
+
+int main( void ) {
+    const double x[] = { 0.0, 0.005, 3.14, 10.0, 51.125, 99.99, 100.0 };
+    double v;
+    int i;
+
+    for ( i = 0; i < 7; i++ ) {
+        v = stdlib_base_besselj1f( x[ i ] );
+        printf( "besselj1f(%lf) = %lf\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">
+
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/math/base/special/besselj0`][@stdlib/math/base/special/besselj0]</span><span class="delimiter">: </span><span class="description">compute the Bessel function of the first kind of order zero.</span>
+-   <span class="package-name">[`@stdlib/math/base/special/bessely0`][@stdlib/math/base/special/bessely0]</span><span class="delimiter">: </span><span class="description">compute the Bessel function of the second kind of order zero.</span>
+-   <span class="package-name">[`@stdlib/math/base/special/bessely1`][@stdlib/math/base/special/bessely1]</span><span class="delimiter">: </span><span class="description">compute the Bessel function of the second kind of order one.</span>
+
+</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">
+
+[bessel-first-kind]: https://en.wikipedia.org/wiki/Bessel_function#Bessel_functions_of_the_first_kind:_J.CE.B1
+
+<!-- <related-links> -->
+
+[@stdlib/math/base/special/besselj0]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/besselj0
+
+[@stdlib/math/base/special/bessely0]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/bessely0
+
+[@stdlib/math/base/special/bessely1]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/bessely1
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/math/base/special/besselj1f/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 uniform = require( '@stdlib/random/array/uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pkg = require( './../package.json' ).name;
+var j1 = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = uniform( 100, 0.0, 100000.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = j1( x[ i % x.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/math/base/special/besselj1f/benchmark/benchmark.native.js

@@ -0,0 +1,62 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 uniform = require( '@stdlib/random/array/uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var j1 = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( j1 instanceof Error )
+};
+
+
+// MAIN //
+
+bench( format( '%s::native', pkg ), opts, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = uniform( 100, 0.0, 100000.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = j1( x[ i % x.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});