# @stdlib/math-base-special-hacovercos

0.3.0 • Public • Published

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# Hacovercosine

Compute the half-value coversed cosine.

The half-value coversed cosine is defined as

## Installation

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

## Usage

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

#### hacovercos( x )

Computes the half-value coversed cosine (in radians).

```var v = hacovercos( 0.0 );
// returns 0.5

v = hacovercos( 3.141592653589793/2.0 );
// returns 1.0

v = hacovercos( -3.141592653589793/6.0 );
// returns 0.25```

## Examples

```var linspace = require( '@stdlib/array-base-linspace' );
var TWO_PI = require( '@stdlib/constants-float64-two-pi' );
var hacovercos = require( '@stdlib/math-base-special-hacovercos' );

var x = linspace( 0.0, TWO_PI, 100 );

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

## C APIs

### Usage

`#include "stdlib/math/base/special/hacovercos.h"`

#### stdlib_base_hacovercos( x )

Computes the half-value coversed cosine (in radians).

```double out = stdlib_base_hacovercos( 0.0 );
// returns 0.5

out = stdlib_base_hacovercos( 3.141592653589793 / 2.0 );
// returns 1.0```

The function accepts the following arguments:

• x: `[in] double` input value.
`double stdlib_base_hacovercos( const double x );`

### Examples

```#include "stdlib/math/base/special/hacovercos.h"
#include <stdio.h>

int main( void ) {
const double x[] = { 0.0, 0.523, 0.785, 1.047, 3.14 };

double y;
int i;
for ( i = 0; i < 5; i++ ) {
y = stdlib_base_hacovercos( x[ i ] );
printf( "hacovercos(%lf) = %lf\n", x[ i ], y );
}
}```

## 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.

## Package Sidebar

### Install

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

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