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https://github.com/stdlib-js/math-base-special-acos
Compute the arccosine of a number.
https://github.com/stdlib-js/math-base-special-acos
acos arccosine inverse javascript math mathematics node node-js nodejs polyfill ponyfill radians stdlib trig trigonometry
Last synced: 1 day ago
JSON representation
Compute the arccosine of a number.
- Host: GitHub
- URL: https://github.com/stdlib-js/math-base-special-acos
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-14T16:39:50.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-12-23T19:21:24.000Z (about 1 month ago)
- Last Synced: 2025-01-24T12:03:34.553Z (3 days ago)
- Topics: acos, arccosine, inverse, javascript, math, mathematics, node, node-js, nodejs, polyfill, ponyfill, radians, stdlib, trig, trigonometry
- Language: Python
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 567 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
Awesome Lists containing this project
README
About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
# acos
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Compute the [arccosine][arccosine] of a double-precision floating-point number.
## Installation
```bash
npm install @stdlib/math-base-special-acos
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var acos = require( '@stdlib/math-base-special-acos' );
```
#### acos( x )
Computes the [arccosine][arccosine] of a double-precision floating-point number (in radians).
```javascript
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`.
```javascript
var v = acos( -3.14 );
// returns NaN
```
## Examples
```javascript
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 ] ) );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/acos.h"
```
#### stdlib_base_acos( x )
Computes the [arccosine][arccosine] of a double-precision floating-point number (in radians).
```c
double out = stdlib_base_acos( 1.0 );
// returns 0.0
out = stdlib_base_acos( 0.707 ); // ~pi/4
// returns ~0.7855
```
The function accepts the following arguments:
- **x**: `[in] double` input value (in radians).
```c
double stdlib_base_acos( const double x );
```
### Examples
```c
#include "stdlib/math/base/special/acos.h"
#include
int main( void ) {
const double x[] = { -1.0, -0.78, -0.56, -0.33, -0.11, 0.11, 0.33, 0.56, 0.78, 1.0 };
double v;
int i;
for ( i = 0; i < 10; i++ ) {
v = stdlib_base_acos( x[ i ] );
printf( "acos(%lf) = %lf\n", x[ i ], v );
}
}
```
* * *
## See Also
- [`@stdlib/math-base/special/acosh`][@stdlib/math/base/special/acosh]: compute the hyperbolic arccosine of a double-precision floating-point number.
- [`@stdlib/math-base/special/asin`][@stdlib/math/base/special/asin]: compute the arcsine of a double-precision floating-point number.
- [`@stdlib/math-base/special/atan`][@stdlib/math/base/special/atan]: compute the arctangent of a double-precision floating-point number.
* * *
## Notice
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## Copyright
Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/math-base-special-acos.svg
[npm-url]: https://npmjs.org/package/@stdlib/math-base-special-acos
[test-image]: https://github.com/stdlib-js/math-base-special-acos/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/math-base-special-acos/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-special-acos/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-acos?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/math-base-special-acos/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-acos/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-acos/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-acos/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-acos/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-acos/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-acos/blob/main/branches.md
[arccosine]: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
[@stdlib/math/base/special/acosh]: https://github.com/stdlib-js/math-base-special-acosh
[@stdlib/math/base/special/asin]: https://github.com/stdlib-js/math-base-special-asin
[@stdlib/math/base/special/atan]: https://github.com/stdlib-js/math-base-special-atan