# @stdlib/math-base-special-sici Release 0.0.5

Sine and cosine integrals.

Keywords
stdlib, stdmath, mathematics, math, special, function, sine, sin, cosine, cos, integral, sici, number, javascript, node, node-js, nodejs
Apache-2.0
Install
``` npm install @stdlib/math-base-special-sici@0.0.5 ```

# sici

Compute the sine and cosine integrals.

The sine integral is defined as

and the cosine integral is defined as

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 