Nightingale Posing Mischievously

# npm

## @stdlib/math-base-special-sincospi

0.0.5 • Public • Published

# sincospi

Simultaneously compute the sine and cosine of a number times π.

## Installation

`npm install @stdlib/math-base-special-sincospi`

## Usage

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

#### sincospi( [out,] x )

Simultaneously computes the sine and cosine of a `number` times π more accurately than `sincos(pi*x)`, especially for large `x`.

```var v = sincospi( 0.0 );
// returns [ 0.0, 1.0 ]

v = sincospi( 0.5 );
// returns [ 1.0, 0.0 ]

v = sincospi( 0.1 );
// returns [ ~0.309, ~0.951 ]

v = sincospi( NaN );
// returns [ NaN, NaN ]```

By default, the function returns a two-element `array` containing `sin(πx)` and `cos(πx)`. To avoid extra memory allocation, the function supports providing an output (destination) object.

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

var out = new Float64Array( 2 );

var v = sincospi( out, 0.0 );
// returns <Float64Array>[ 0.0, 1.0 ]

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

## Examples

```var linspace = require( '@stdlib/array-linspace' );
var sincospi = require( '@stdlib/math-base-special-sincospi' );

var x = linspace( 0.0, 2.0, 101 );
var i;

for ( i = 0; i < x.length; i++ ) {
console.log( sincospi( x[ i ] ) );
}```

## 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.

### Install

`npm i @stdlib/math-base-special-sincospi`

stdlib.io

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0.0.5

Apache-2.0

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