@stdlib/math-base-special-acos

Compute the arccosine of a number.

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README

acos

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Compute the arccosine of a number.

Installation

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

Usage

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

acos( x )

Computes the arccosine of a number (in radians).

var v = acos( 1.0 );
// returns 0.0

v = acos( 0.707 ); // ~pi/4
// returns ~0.7855

v = acos( 0.866 ); // ~pi/6
// returns ~0.5236

v = acos( NaN );
// returns NaN

The domain of x is restricted to [-1,1]. If |x| > 1, the function returns NaN.

var v = acos( -3.14 );
// returns NaN

Examples

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

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

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

See Also

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.

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License

See LICENSE.

Copyright

Copyright © 2016-2022. The Stdlib Authors.