@stdlib/blas-dswap NPM

dswap

Interchange two double-precision floating-point vectors.

Installation

npm install @stdlib/blas-dswap

Usage

var dswap = require( '@stdlib/blas-dswap' );

dswap( x, y )

Interchanges two double-precision floating-point vectors x and y.

var Float64Array = require( '@stdlib/array-float64' );
var array = require( '@stdlib/ndarray-array' );

var x = array( new Float64Array( [ 4.0, 2.0, -3.0, 5.0, -1.0 ] ) );
var y = array( new Float64Array( [ 2.0, 6.0, -1.0, -4.0, 8.0 ] ) );

dswap( x, y );

var xbuf = x.data;
// returns <Float64Array>[ 2.0, 6.0, -1.0, -4.0, 8.0 ]

var ybuf = y.data;
// returns <Float64Array>[ 4.0, 2.0, -3.0, 5.0, -1.0 ]

The function has the following parameters:

x: a 1-dimensional ndarray whose underlying data type is float64.
y: a 1-dimensional ndarray whose underlying data type is float64.

Notes

dswap() provides a higher-level interface to the BLAS level 1 function dswap.

Examples

var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var Float64Array = require( '@stdlib/array-float64' );
var array = require( '@stdlib/ndarray-array' );
var dswap = require( '@stdlib/blas-dswap' );

var x = array( new Float64Array( 10 ) );
var y = array( new Float64Array( 10 ) );

var rand1 = discreteUniform.factory( 0, 100 );
var rand2 = discreteUniform.factory( 0, 10 );

var i;
for ( i = 0; i < x.length; i++ ) {
    x.set( i, rand1() );
    y.set( i, rand2() );
}
console.log( x.data );
console.log( y.data );

dswap( x, y );
console.log( x.data );
console.log( y.data );

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.