124 lines
2.7 KiB
Markdown
124 lines
2.7 KiB
Markdown
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@license Apache-2.0
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Copyright (c) 2020 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 double-precision floating-point vectors.
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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/dswap' );
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```
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#### dswap( x, y )
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Interchanges two double-precision floating-point vectors `x` and `y`.
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```javascript
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var Float64Array = require( '@stdlib/array/float64' );
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var array = require( '@stdlib/ndarray/array' );
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var x = array( new Float64Array( [ 4.0, 2.0, -3.0, 5.0, -1.0 ] ) );
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var y = array( new Float64Array( [ 2.0, 6.0, -1.0, -4.0, 8.0 ] ) );
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dswap( x, y );
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var xbuf = x.data;
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// returns <Float64Array>[ 2.0, 6.0, -1.0, -4.0, 8.0 ]
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var ybuf = y.data;
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// returns <Float64Array>[ 4.0, 2.0, -3.0, 5.0, -1.0 ]
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```
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The function has the following parameters:
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- **x**: a 1-dimensional [`ndarray`][@stdlib/ndarray/array] whose underlying data type is `float64`.
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- **y**: a 1-dimensional [`ndarray`][@stdlib/ndarray/array] whose underlying data type is `float64`.
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- `dswap()` provides a higher-level interface to the [BLAS][blas] level 1 function [`dswap`][@stdlib/blas/base/dswap].
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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/base/discrete-uniform' );
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var Float64Array = require( '@stdlib/array/float64' );
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var array = require( '@stdlib/ndarray/array' );
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var dswap = require( '@stdlib/blas/dswap' );
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var x = array( new Float64Array( 10 ) );
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var y = array( new Float64Array( 10 ) );
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var rand1 = discreteUniform.factory( 0, 100 );
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var rand2 = discreteUniform.factory( 0, 10 );
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var i;
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for ( i = 0; i < x.length; i++ ) {
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x.set( i, rand1() );
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y.set( i, rand2() );
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}
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console.log( x.data );
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console.log( y.data );
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dswap( x, y );
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console.log( x.data );
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console.log( y.data );
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[blas]: http://www.netlib.org/blas
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[@stdlib/blas/base/dswap]: https://www.npmjs.com/package/@stdlib/blas/tree/main/base/dswap
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[@stdlib/ndarray/array]: https://www.npmjs.com/package/@stdlib/ndarray-array
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</section>
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<!-- /.links -->
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