dlapy2

LAPACK routine to calculate sqrt(x^2 + y^2) in a manner which doesn't cause unnecessary overflow.

Installation

npm install @stdlib/lapack-base-dlapy2

Usage

var dlapy2 = require( '@stdlib/lapack-base-dlapy2' );

dlapy2( x, y )

Computes sqrt(x^2 + y^2) in a manner which doesn't cause unnecessary overflow.

var out = dlapy2( 3.0, 4.0 );
// returns 5.0

The function has the following parameters:

• x: first input number.
• y: second input number.

Notes

• dlapy2() corresponds to the LAPACK function dlapy2.

Examples

var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var dlapy2 = require( '@stdlib/lapack-base-dlapy2' );

var opts = {
    'dtype': 'float64'
};
var x = discreteUniform( 100, -50, 50, opts );
var y = discreteUniform( 100, -50, 50, opts );

logEachMap( 'dlapy2( %d, %d ) = %0.4f', x, y, dlapy2 );

C APIs

Usage

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Examples

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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.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.