https://github.com/stdlib-js/math-base-special-cosd
Compute the cosine of an angle measured in degrees.
https://github.com/stdlib-js/math-base-special-cosd
cos cosine cot cotd degree javascript math mathematics node node-js nodejs sin sine stdlib tan tangent trig trigonometry
Last synced: 4 months ago
JSON representation
Compute the cosine of an angle measured in degrees.
- Host: GitHub
- URL: https://github.com/stdlib-js/math-base-special-cosd
- Owner: stdlib-js
- License: apache-2.0
- Created: 2024-03-17T19:52:24.000Z (about 2 years ago)
- Default Branch: main
- Last Pushed: 2026-01-01T07:17:34.000Z (4 months ago)
- Last Synced: 2026-01-06T02:44:09.224Z (4 months ago)
- Topics: cos, cosine, cot, cotd, degree, javascript, math, mathematics, node, node-js, nodejs, sin, sine, stdlib, tan, tangent, trig, trigonometry
- Language: Python
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 339 KB
- Stars: 1
- Watchers: 2
- 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
- Notice: NOTICE
Awesome Lists containing this project
README
About stdlib...
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# cosd
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Computes the [cosine][trigonometric-functions] of an angle measured in degrees.
## Installation
```bash
npm install @stdlib/math-base-special-cosd
```
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 cosd = require( '@stdlib/math-base-special-cosd' );
```
#### cosd( x )
Computes the [cosine][trigonometric-functions] of `x` (in degrees).
```javascript
var v = cosd( 0.0 );
// returns 1.0
v = cosd( 60.0 );
// returns ~0.5
v = cosd( 90.0 );
// returns 0.0
v = cosd( NaN );
// returns NaN
```
## Examples
```javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var cosd = require( '@stdlib/math-base-special-cosd' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -180, 180, opts );
logEachMap( 'cosd(%0.4f) = %0.4f', x, cosd );
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/cosd.h"
```
#### stdlib_base_cosd( x )
Computes the [cosine][trigonometric-functions] of `x` (in degrees).
```c
double out = stdlib_base_cosd( 0.0 );
// returns 1.0
out = stdlib_base_cosd( 60.0 );
// returns ~0.5
```
The function accepts the following arguments:
- **x**: `[in] double` input value.
```c
double stdlib_base_cosd( const double x );
```
### Examples
```c
#include "stdlib/math/base/special/cosd.h"
#include
int main( void ) {
const double x[] = { 0.0, 30.0, 45.0, 60.0, 90.0 };
double y;
int i;
for ( i = 0; i < 5; i++ ) {
y = stdlib_base_cosd( x[ i ] );
printf( "cosd(%lf) = %lf\n", x[ i ], y );
}
}
```
* * *
## See Also
- [`@stdlib/math-base/special/tand`][@stdlib/math/base/special/tand]: compute the tangent of an angle measured in degrees.
* * *
## 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]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/math-base-special-cosd.svg
[npm-url]: https://npmjs.org/package/@stdlib/math-base-special-cosd
[test-image]: https://github.com/stdlib-js/math-base-special-cosd/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/math-base-special-cosd/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-special-cosd/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-cosd?branch=main
[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
[chat-url]: https://stdlib.zulipchat.com
[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-cosd/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-cosd/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-cosd/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-cosd/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-cosd/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-cosd/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-cosd/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-special-cosd/main/LICENSE
[trigonometric-functions]: https://en.wikipedia.org/wiki/Trigonometric_functions
[@stdlib/math/base/special/tand]: https://github.com/stdlib-js/math-base-special-tand