feat: add lapack/base/dladiv

lib/node_modules/@stdlib/lapack/base/dladiv/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# dladiv
+
+> Divide two double-precision complex floating-point numbers in real arithmetic.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var dladiv = require( '@stdlib/lapack/base/dladiv' );
+```
+
+#### dladiv( a, b, c, d, P, Q )
+
+Divides two double-precision complex floating-point numbers in real arithmetic.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var P = new Float64Array( 1 );
+var Q = new Float64Array( 1 );
+
+dladiv( -13.0, -1.0, -2.0, 1.0, P, Q );
+// P => <Float64Array>[ 5.0 ]
+// Q => <Float64Array>[ 3.0 ]
+```
+
+The function has the following parameters:
+
+-   **a**: real component of numerator.
+-   **b**: imaginary component of numerator.
+-   **c**: real component of denominator.
+-   **d**: imaginary component of denominator.
+-   **P**: [`Float64Array`][mdn-float64array] containing a single element which is overwritten by the real part of the quotient.
+-   **Q**: [`Float64Array`][mdn-float64array] containing a single element which is overwritten by the imaginary part of the quotient.
+
+#### dladiv.ndarray( a, b, c, d, P, offsetP, Q, offsetQ )
+
+Divides two double-precision complex floating-point numbers in real arithmetic using alternative indexing semantics.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var P = new Float64Array( 1 );
+var Q = new Float64Array( 1 );
+
+dladiv.ndarray( -13.0, -1.0, -2.0, 1.0, P, 0, Q, 0 );
+// P => <Float64Array>[ 5.0 ]
+// Q => <Float64Array>[ 3.0 ]
+```
+
+The function has the following parameters:
+
+-   **a**: real component of numerator.
+-   **b**: imaginary component of numerator.
+-   **c**: real component of denominator.
+-   **d**: imaginary component of denominator.
+-   **P**: [`Float64Array`][mdn-float64array] containing an element which is overwritten by the real part of the quotient.
+-   **offsetP**: index of the element in `P`.
+-   **Q**: [`Float64Array`][mdn-float64array] containing an element which is overwritten by the imaginary part of the quotient.
+-   **offsetQ**: index of the element in `Q`.
+
+While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, the offset parameters support indexing semantics based on starting indices. For example,
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var P = new Float64Array( [ 0.0, 0.0, 0.0 ] );
+var Q = new Float64Array( [ 0.0, 0.0, 0.0 ] );
+
+dladiv.ndarray( 2.0, 1.0, 3.0, 4.0, P, 1, Q, 2 );
+// P => <Float64Array>[ 0.0, 0.4, 0.0 ]
+// Q => <Float64Array>[ 0.0, 0.0, -0.2 ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   `dladiv()` corresponds to the [LAPACK][LAPACK] function [`dladiv`][lapack-dladiv].
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+var dladiv = require( '@stdlib/lapack/base/dladiv' );
+
+var P = new Float64Array( 1 );
+var Q = new Float64Array( 1 );
+dladiv( 2.0, 1.0, 3.0, 4.0, P, Q );
+console.log( '(2+i)/(3+4i) =', P[ 0 ], '+', Q[ 0 ], '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
+TODO
+```
+
+#### TODO
+
+TODO.
+
+```c
+TODO
+```
+
+TODO
+
+```c
+TODO
+```
+
+</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
+TODO
+```
+
+</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">
+
+[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
+
+[lapack-dladiv]: https://www.netlib.org/lapack/explore-html/d5/db7/group__ladiv_gacbc97eb1922a833ffe257e1731bb0aaa.html
+
+[mdn-float64array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float64Array
+
+[lapack]: https://www.netlib.org/lapack/explore-html/
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/lapack/base/dladiv/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 Float64Array = require( '@stdlib/array/float64' );
+var pkg = require( './../package.json' ).name;
+var dladiv = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'float64'
+};
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var re;
+	var im;
+	var N;
+	var P;
+	var Q;
+	var i;
+	var j;
+	var k;
+
+	N = 100;
+	re = uniform( N, -500.0, 500.0, options );
+	im = uniform( N, -500.0, 500.0, options );
+
+	P = new Float64Array( 1 );
+	Q = new Float64Array( 1 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		j = i % N;
+		k = ( i+1 ) % N;
+		dladiv( re[ j ], im[ j ], re[ k ], im[ k ], P, Q );
+		if ( isnan( P[ 0 ] ) || isnan( Q[ 0 ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( P[ 0 ] ) || isnan( Q[ 0 ] ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/lapack/base/dladiv/benchmark/benchmark.ndarray.js

@@ -0,0 +1,72 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 Float64Array = require( '@stdlib/array/float64' );
+var pkg = require( './../package.json' ).name;
+var dladiv = require( './../lib/ndarray.js' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'float64'
+};
+
+
+// MAIN //
+
+bench( pkg+':ndarray', function benchmark( b ) {
+	var re;
+	var im;
+	var N;
+	var P;
+	var Q;
+	var i;
+	var j;
+	var k;
+
+	N = 100;
+	re = uniform( N, -500.0, 500.0, options );
+	im = uniform( N, -500.0, 500.0, options );
+
+	P = new Float64Array( 1 );
+	Q = new Float64Array( 1 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		j = i % N;
+		k = ( i+1 ) % N;
+		dladiv( re[ j ], im[ j ], re[ k ], im[ k ], P, 0, Q, 0 );
+		if ( isnan( P[ 0 ] ) || isnan( Q[ 0 ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( P[ 0 ] ) || isnan( Q[ 0 ] ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});