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https://github.com/stdlib-js/math-iter-special-havercos
Create an iterator which computes the half-value versed cosine for each iterated value.
https://github.com/stdlib-js/math-iter-special-havercos
cos cosine hac havercos havercosin havercosine haversed haversed-cosine hvc javascript math mathematics node node-js nodejs radians stdlib trig trigonometry versed-cosine
Last synced: about 1 month ago
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Create an iterator which computes the half-value versed cosine for each iterated value.
- Host: GitHub
- URL: https://github.com/stdlib-js/math-iter-special-havercos
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-15T17:11:05.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-11-01T11:56:48.000Z (about 2 months ago)
- Last Synced: 2024-11-15T16:44:05.051Z (about 1 month ago)
- Topics: cos, cosine, hac, havercos, havercosin, havercosine, haversed, haversed-cosine, hvc, javascript, math, mathematics, node, node-js, nodejs, radians, stdlib, trig, trigonometry, versed-cosine
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 1.44 MB
- Stars: 2
- 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
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README
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# iterHavercos
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Create an [iterator][mdn-iterator-protocol] which computes the [half-value versed cosine][@stdlib/math/base/special/havercos] for each iterated value.
## Installation
```bash
npm install @stdlib/math-iter-special-havercos
```
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 iterHavercos = require( '@stdlib/math-iter-special-havercos' );
```
#### iterHavercos( iterator )
Returns an [iterator][mdn-iterator-protocol] which iteratively computes the [half-value versed cosine][@stdlib/math/base/special/havercos].
```javascript
var array2iterator = require( '@stdlib/array-to-iterator' );
var it = iterHavercos( array2iterator( [ 1.57, 0.785 ] ) );
// returns
var v = it.next().value;
// returns ~0.5
v = it.next().value;
// returns ~0.854
// ...
```
The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:
- **next**: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a `value` property and a `done` property having a `boolean` value indicating whether the iterator is finished.
- **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.
## Notes
- If an iterated value is non-numeric (including `NaN`), the returned [iterator][mdn-iterator-protocol] returns `NaN`. If non-numeric iterated values are possible, you are advised to provide an [`iterator`][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly.
- If an environment supports `Symbol.iterator` **and** a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
## Examples
```javascript
var uniform = require( '@stdlib/random-iter-uniform' );
var iterHavercos = require( '@stdlib/math-iter-special-havercos' );
// Create a seeded iterator for generating pseudorandom numbers:
var rand = uniform( 0.0, 6.28, {
'seed': 1234,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterator:
var it = iterHavercos( rand );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}
```
* * *
## See Also
- [`@stdlib/math-base/special/havercos`][@stdlib/math/base/special/havercos]: compute the half-value versed cosine.
- [`@stdlib/math-iter/special/haversin`][@stdlib/math/iter/special/haversin]: create an iterator which computes the half-value versed sine for each iterated value.
- [`@stdlib/math-iter/special/vercos`][@stdlib/math/iter/special/vercos]: create an iterator which computes the versed cosine for each iterated value.
* * *
## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/math-iter-special-havercos.svg
[npm-url]: https://npmjs.org/package/@stdlib/math-iter-special-havercos
[test-image]: https://github.com/stdlib-js/math-iter-special-havercos/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/math-iter-special-havercos/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-iter-special-havercos/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/math-iter-special-havercos?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-iter-special-havercos/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-iter-special-havercos/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-iter-special-havercos/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-iter-special-havercos/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-iter-special-havercos/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-iter-special-havercos/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-iter-special-havercos/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-iter-special-havercos/main/LICENSE
[mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol
[@stdlib/math/base/special/havercos]: https://github.com/stdlib-js/math-base-special-havercos
[@stdlib/math/iter/special/haversin]: https://github.com/stdlib-js/math-iter-special-haversin
[@stdlib/math/iter/special/vercos]: https://github.com/stdlib-js/math-iter-special-vercos