Package Exports

@stdlib/math-base-special-sici

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@stdlib/math-base-special-sici) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

sici

$NPM version$ $Build Status$ $Coverage Status$ $dependencies$

Compute the sine and cosine integrals.

The sine integral is defined as

$Sine integral.$

and the cosine integral is defined as

$Cosine integral.$

where γ is the Euler-Mascheroni constant.

Installation

npm install @stdlib/math-base-special-sici

Usage

var sici = require( '@stdlib/math-base-special-sici' );

sici( [out,] x )

Computes the sine and cosine integrals.

var v = sici( 3.0 );
// returns [ ~1.849, ~0.12 ]

v = sici( 0.0 );
// returns [ 0.0, -Infinity ]

v = sici( -9.0 );
// returns [ ~-1.665, ~0.055 ]

v = sici( NaN );
// returns [ NaN, NaN ]

By default, the function returns the sine and cosine integrals as a two-element array. To avoid unnecessary memory allocation, the function supports providing an output (destination) object.

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

var out = new Float64Array( 2 );

var v = sici( out, 3.0 );
// returns <Float64Array>[ ~1.849, ~0.12 ]

var bool = ( v === out );
// returns true

Examples

var randu = require( '@stdlib/random-base-randu' );
var sici = require( '@stdlib/math-base-special-sici' );

var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = randu() * 100.0;
    y = sici( x );
    console.log( 'si(%d) = %d, ci(%d) = %d', x, y[ 0 ], x, y[ 1 ] );
}

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.

@stdlib/math-base-special-sici