https://github.com/stdlib-js/ndarray-base-fill-by
Fill an input ndarray according to a callback function.
https://github.com/stdlib-js/ndarray-base-fill-by
apply array base fill for-each foreach javascript map ndarray node node-js nodejs stdlib strided transform unary
Last synced: about 2 months ago
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Fill an input ndarray according to a callback function.
- Host: GitHub
- URL: https://github.com/stdlib-js/ndarray-base-fill-by
- Owner: stdlib-js
- License: apache-2.0
- Created: 2025-03-22T10:30:12.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2025-03-23T03:28:21.000Z (about 1 year ago)
- Last Synced: 2025-03-23T04:24:01.190Z (about 1 year ago)
- Topics: apply, array, base, fill, for-each, foreach, javascript, map, ndarray, node, node-js, nodejs, stdlib, strided, transform, unary
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 473 KB
- Stars: 0
- 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
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README
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# fillBy
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Fill an input ndarray according to a callback function.
## Installation
```bash
npm install @stdlib/ndarray-base-fill-by
```
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 fillBy = require( '@stdlib/ndarray-base-fill-by' );
```
#### fillBy( x, fcn\[, thisArg] )
Fills an input ndarray according to a callback function.
```javascript
var array = require( '@stdlib/ndarray-array' );
function fcn() {
return 10.0;
}
var x = array( [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ] );
// returns [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ]
var out = fillBy( x, fcn );
// returns [ [ [ 10.0, 10.0 ] ], [ [ 10.0, 10.0 ] ], [ [ 10.0, 10.0 ] ] ]
var bool = ( out === x );
// returns true
```
The function accepts the following arguments:
- **x**: array-like object containing an input ndarray.
- **fcn**: callback function.
- **thisArg**: callback function execution context (_optional_).
To set the callback function execution context, provide a `thisArg`.
```javascript
var array = require( '@stdlib/ndarray-array' );
function fcn( value ) {
return value * 10.0;
}
var x = array( [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ] );
// returns [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ]
var ctx = {
'factor': 10.0
};
var out = fillBy( x, fcn, ctx );
// returns [ [ [ 10.0, 20.0 ] ], [ [ 30.0, 40.0 ] ], [ [ 50.0, 60.0 ] ] ]
var bool = ( out === x );
// returns true
```
## Notes
- A provided ndarray should be an object with the following properties:
- **dtype**: data type.
- **data**: data buffer.
- **shape**: dimensions.
- **strides**: stride lengths.
- **offset**: index offset.
- **order**: specifies whether an ndarray is row-major (C-style) or column major (Fortran-style).
- The callback function is provided the following arguments:
- **value**: current array element.
- **indices**: current array element indices.
- **arr**: the input ndarray.
- The function **mutates** the input ndarray.
- The function assumes that each element in the underlying input ndarray data buffer has one, and only one, corresponding element in input ndarray view (i.e., a provided ndarray is not a broadcasted ndarray view).
## Examples
```javascript
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' ).factory;
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var zeros = require( '@stdlib/ndarray-zeros' );
var fillBy = require( '@stdlib/ndarray-base-fill-by' );
// Create a zero-filled ndarray:
var x = zeros( [ 5, 2 ], {
'dtype': 'generic'
});
console.log( ndarray2array( x ) );
// Fill the ndarray with random values:
fillBy( x, discreteUniform( -100, 100 ) );
console.log( ndarray2array( x ) );
```
* * *
## 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/ndarray-base-fill-by.svg
[npm-url]: https://npmjs.org/package/@stdlib/ndarray-base-fill-by
[test-image]: https://github.com/stdlib-js/ndarray-base-fill-by/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/ndarray-base-fill-by/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/ndarray-base-fill-by/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/ndarray-base-fill-by?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/ndarray-base-fill-by/tree/deno
[deno-readme]: https://github.com/stdlib-js/ndarray-base-fill-by/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/ndarray-base-fill-by/tree/umd
[umd-readme]: https://github.com/stdlib-js/ndarray-base-fill-by/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/ndarray-base-fill-by/tree/esm
[esm-readme]: https://github.com/stdlib-js/ndarray-base-fill-by/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/ndarray-base-fill-by/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/ndarray-base-fill-by/main/LICENSE