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‎CHANGELOG.md‎

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### Features
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- [`68ef817`](https://github.com/stdlib-js/stdlib/commit/68ef81746517bdba3d02ea39e564034a9d999194) - add `blas/base/ndarray/dswap` [(#11715)](https://github.com/stdlib-js/stdlib/pull/11715)
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- [`538ced0`](https://github.com/stdlib-js/stdlib/commit/538ced061007046094f1786c6d3fda9a113130b3) - update `blas/ext/base` TypeScript declarations [(#11737)](https://github.com/stdlib-js/stdlib/pull/11737)
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- [`5d7de9d`](https://github.com/stdlib-js/stdlib/commit/5d7de9dc58abb2a9b049a17b87f988d9d52ed56e) - add `cunitspace` to namespace
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- [`ae4bc4f`](https://github.com/stdlib-js/stdlib/commit/ae4bc4f7d737d97ac8e404e86402a41baa851952) - add `zunitspace` to namespace
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<details>
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- [`68ef817`](https://github.com/stdlib-js/stdlib/commit/68ef81746517bdba3d02ea39e564034a9d999194) - **feat:** add `blas/base/ndarray/dswap` [(#11715)](https://github.com/stdlib-js/stdlib/pull/11715) _(by Kaustubh Patange)_
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- [`40db61d`](https://github.com/stdlib-js/stdlib/commit/40db61db7ca352e3a55a699a010d984fc05f6144) - **chore:** follow-up fixes [(#11721)](https://github.com/stdlib-js/stdlib/pull/11721) _(by Philipp Burckhardt)_
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- [`20303f7`](https://github.com/stdlib-js/stdlib/commit/20303f76bbd7bb77a4d612c86632f2f876a99110) - **chore:** modernize examples and benchmarks _(by Athan Reines)_
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- [`e2618f8`](https://github.com/stdlib-js/stdlib/commit/e2618f884bbcbbb72692813c76971c92b34c908c) - **chore:** modernize examples and benchmarks _(by Athan Reines)_

‎base/ndarray/dswap/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2026 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# dswap
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> Interchange two one-dimensional double-precision floating-point ndarrays.
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<section class="intro">
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var dswap = require( '@stdlib/blas/base/ndarray/dswap' );
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```
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#### dswap( arrays )
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Interchanges two one-dimensional double-precision floating-point ndarrays.
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```javascript
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var Float64Array = require( '@stdlib/array/float64' );
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var ndarray = require( '@stdlib/ndarray/base/ctor' );
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var xbuf = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
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var x = new ndarray( 'float64', xbuf, [ 5 ], [ 1 ], 0, 'row-major' );
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var ybuf = new Float64Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
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var y = new ndarray( 'float64', ybuf, [ 5 ], [ 1 ], 0, 'row-major' );
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var z = dswap( [ x, y ] );
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// x => <ndarray>[ 6.0, 7.0, 8.0, 9.0, 10.0 ]
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// y => <ndarray>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
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var bool = ( y === z );
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// returns true
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```
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The function has the following parameters:
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- **arrays**: array-like object containing two input ndarrays.
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</section>
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<!-- /.usage -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
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var ndarray = require( '@stdlib/ndarray/base/ctor' );
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var ndarray2array = require( '@stdlib/ndarray/to-array' );
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var dswap = require( '@stdlib/blas/base/ndarray/dswap' );
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var opts = {
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'dtype': 'float64'
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};
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var xbuf = discreteUniform( 10, 0, 100, opts );
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var x = new ndarray( opts.dtype, xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
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console.log( ndarray2array( x ) );
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var ybuf = discreteUniform( 10, 0, 100, opts );
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var y = new ndarray( opts.dtype, ybuf, [ ybuf.length ], [ 1 ], 0, 'row-major' );
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console.log( ndarray2array( y ) );
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var out = dswap( [ x, y ] );
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console.log( ndarray2array( x ) );
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console.log( ndarray2array( out ) );
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```
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</section>
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<!-- /.examples -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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</section>
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<!-- /.links -->

‎base/ndarray/dswap/benchmark/benchmark.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var uniform = require( '@stdlib/random/array/uniform' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var pow = require( '@stdlib/math/base/special/pow' );
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var ndarray = require( '@stdlib/ndarray/base/ctor' );
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var format = require( '@stdlib/string/format' );
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var pkg = require( './../package.json' ).name;
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var dswap = require( './../lib' );
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// VARIABLES //
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var options = {
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'dtype': 'float64'
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};
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// FUNCTIONS //
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/**
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* Creates a benchmark function.
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*
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* @private
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* @param {PositiveInteger} len - array length
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* @returns {Function} benchmark function
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*/
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function createBenchmark( len ) {
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var xbuf;
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var ybuf;
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var x;
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var y;
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xbuf = uniform( len, -100.0, 100.0, options );
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x = new ndarray( options.dtype, xbuf, [ len ], [ 1 ], 0, 'row-major' );
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ybuf = uniform( len, -100.0, 100.0, options );
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y = new ndarray( options.dtype, ybuf, [ len ], [ 1 ], 0, 'row-major' );
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return benchmark;
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/**
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* Benchmark function.
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*
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* @private
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* @param {Benchmark} b - benchmark instance
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*/
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function benchmark( b ) {
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var z;
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var i;
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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z = dswap( [ x, y ] );
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if ( typeof z !== 'object' ) {
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b.fail( 'should return an ndarray' );
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}
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}
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b.toc();
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if ( isnan( z.get( i%len ) ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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}
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}
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// MAIN //
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/**
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* Main execution sequence.
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*
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* @private
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*/
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function main() {
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var len;
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var min;
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var max;
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var f;
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var i;
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min = 1; // 10^min
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max = 6; // 10^max
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for ( i = min; i <= max; i++ ) {
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len = pow( 10, i );
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f = createBenchmark( len );
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bench( format( '%s:len=%d', pkg, len ), f );
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}
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}
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main();

‎base/ndarray/dswap/docs/repl.txt‎

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{{alias}}( arrays )
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Interchanges two one-dimensional double-precision floating-point ndarrays.
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If provided an empty input ndarray, the function returns the output ndarray
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unchanged.
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Parameters
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----------
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arrays: ArrayLikeObject<ndarray>
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Array-like object containing two input ndarrays.
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Returns
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-------
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out: ndarray
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The second input ndarray.
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Examples
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--------
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> var xbuf = new {{alias:@stdlib/array/float64}}( [ 4.0, 2.0, -3.0 ] );
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> var ybuf = new {{alias:@stdlib/array/float64}}( [ 0.0, 0.0, 0.0 ] );
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> var dt = 'float64';
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> var sh = [ xbuf.length ];
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> var st = [ 1 ];
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> var oo = 0;
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> var ord = 'row-major';
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> var x = new {{alias:@stdlib/ndarray/ctor}}( dt, xbuf, sh, st, oo, ord );
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> var y = new {{alias:@stdlib/ndarray/ctor}}( dt, ybuf, sh, st, oo, ord );
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> {{alias}}( [ x, y ] );
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> x
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<ndarray>[ 0.0, 0.0, 0.0 ]
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> y
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<ndarray>[ 4.0, 2.0, -3.0 ]
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See Also
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--------
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‎base/ndarray/dswap/docs/types/index.d.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// TypeScript Version: 4.1
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/// <reference types="@stdlib/types"/>
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import { float64ndarray } from '@stdlib/types/ndarray';
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/**
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* Interchanges two one-dimensional double-precision floating-point ndarrays.
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*
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* @param arrays - array-like object containing two input ndarrays
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* @returns second input ndarray
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*
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* @example
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* var Float64Array = require( '@stdlib/array/float64' );
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* var ndarray = require( '@stdlib/ndarray/base/ctor' );
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*
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* var xbuf = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
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* var x = new ndarray( 'float64', xbuf, [ 5 ], [ 1 ], 0, 'row-major' );
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*
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* var ybuf = new Float64Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
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* var y = new ndarray( 'float64', ybuf, [ 5 ], [ 1 ], 0, 'row-major' );
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*
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* var z = dswap( [ x, y ] );
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* // x => <ndarray>[ 6.0, 7.0, 8.0, 9.0, 10.0 ]
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* // y => <ndarray>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
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*
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* var bool = ( z === y );
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* // returns true
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*/
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declare function dswap( arrays: [ float64ndarray, float64ndarray ] ): float64ndarray;
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// EXPORTS //
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export = dswap;

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