https://github.com/stdlib-js/ndarray-base-fliplr
Return a view of an input ndarray in which the order of elements along the last dimension is reversed.
https://github.com/stdlib-js/ndarray-base-fliplr
base data flip javascript matrix ndarray node node-js nodejs reverse slice stdlib structure types vector view
Last synced: about 1 month ago
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Return a view of an input ndarray in which the order of elements along the last dimension is reversed.
- Host: GitHub
- URL: https://github.com/stdlib-js/ndarray-base-fliplr
- Owner: stdlib-js
- License: apache-2.0
- Created: 2023-10-15T07:59:55.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2024-12-30T02:20:48.000Z (9 months ago)
- Last Synced: 2025-07-27T07:52:01.920Z (2 months ago)
- Topics: base, data, flip, javascript, matrix, ndarray, node, node-js, nodejs, reverse, slice, stdlib, structure, types, vector, view
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 1.03 MB
- 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
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README
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# fliplr
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Return a view of an input ndarray in which the order of elements along the last dimension is reversed.
## Installation
```bash
npm install @stdlib/ndarray-base-fliplr
```
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 fliplr = require( '@stdlib/ndarray-base-fliplr' );
```
#### fliplr( x, writable )
Returns a view of an input ndarray in which the order of elements along the last dimension is reversed.
```javascript
var ndarray = require( '@stdlib/ndarray-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 3, 2 ];
var strides = [ 2, 1 ];
var offset = 0;
var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
// returns
var sh = x.shape;
// returns [ 3, 2 ]
var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
var y = fliplr( x, false );
// returns
sh = y.shape;
// returns [ 3, 2 ]
arr = ndarray2array( y );
// returns [ [ 2.0, 1.0 ], [ 4.0, 3.0 ], [ 6.0, 5.0 ] ]
```
The function accepts the following arguments:
- **x**: input ndarray.
- **writable**: boolean indicating whether a returned ndarray should be writable.
## Notes
- If provided a zero-dimensional ndarray, as the ndarray has no dimensions to reverse, the function simply returns a new view of the input ndarray.
- The `writable` parameter **only** applies to ndarray constructors supporting **read-only** instances.
## Examples
```javascript
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var fliplr = require( '@stdlib/ndarray-base-fliplr' );
// Create a linear ndarray buffer:
var buf = zeroTo( 16 );
// Create a three-dimensional ndarray:
var x = array( buf, {
'shape': [ 2, 4, 2 ]
});
// Reverse the order of last dimension:
var y = fliplr( x, false );
// returns
var a = ndarray2array( y );
// returns [ [ [ 1, 0 ], [ 3, 2 ], [ 5, 4 ], [ 7, 6 ] ], [ [ 9, 8 ], [ 11, 10 ], [ 13, 12 ], [ 15, 14 ] ] ]
```
* * *
## 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/ndarray-base-fliplr.svg
[npm-url]: https://npmjs.org/package/@stdlib/ndarray-base-fliplr
[test-image]: https://github.com/stdlib-js/ndarray-base-fliplr/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/ndarray-base-fliplr/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/ndarray-base-fliplr/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/ndarray-base-fliplr?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/ndarray-base-fliplr/tree/deno
[deno-readme]: https://github.com/stdlib-js/ndarray-base-fliplr/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/ndarray-base-fliplr/tree/umd
[umd-readme]: https://github.com/stdlib-js/ndarray-base-fliplr/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/ndarray-base-fliplr/tree/esm
[esm-readme]: https://github.com/stdlib-js/ndarray-base-fliplr/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/ndarray-base-fliplr/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/ndarray-base-fliplr/main/LICENSE