# @stdlib/math-base-special-ahaversin

0.2.1 • Public • Published

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# Archaversine

Compute the inverse half-value versed sine.

The inverse half-value versed sine is defined as

## Installation

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

## Usage

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

#### ahaversin( x )

Computes the inverse half-value versed sine.

var v = ahaversin( 0.0 );
// returns 0.0

v = ahaversin( 1.0 );
// returns ~3.1416

v = ahaversin( 0.5 );
// returns ~1.5708

If x < 0, x > 1, or x is NaN, the function returns NaN.

var v = ahaversin( 1.5 );
// returns NaN

v = ahaversin( -3.14 );
// returns NaN

v = ahaversin( NaN );
// returns NaN

## Examples

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

var x = linspace( 0.0, 1.0, 100 );

var i;
for ( i = 0; i < x.length; i++ ) {
console.log( ahaversin( 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.

## Package Sidebar

### Install

npm i @stdlib/math-base-special-ahaversin

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