npm package: @stdlib/ndarray-base-fill
Description: Fill an input ndarray with a specified value.
Author: The Stdlib Authors
Latest version: 0.1.1

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# fill

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Fill an input ndarray with a specified value.

<section class="intro">

</section>

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<section class="installation">

## Installation

```bash
npm install @stdlib/ndarray-base-fill
```

</section>

<section class="usage">

## Usage

```javascript
var fill = require( '@stdlib/ndarray-base-fill' );
```

#### fill( x, value )

Fills an input ndarray with a specified value.

<!-- eslint-disable max-len -->

```javascript
var array = require( '@stdlib/ndarray-array' );

var x = array( [ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ] );
// returns <ndarray>[ [ [ 1.0, 2.0 ] ], [ [ 3.0, 4.0 ] ], [ [ 5.0, 6.0 ] ] ]

var out = fill( x, 10.0 );
// returns <ndarray>[ [ [ 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**: input ndarray.
-   **value**: scalar value.

</section>

<!-- /.usage -->

<section class="notes">

## 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).

-   If `value` is a number and `x` has a complex [data type][@stdlib/ndarray/dtypes], the function fills an input ndarray with a complex number whose real component equals the provided scalar `value` and whose imaginary component is zero.

-   A `value` must be able to safely cast to the input ndarray [data type][@stdlib/ndarray/dtypes]. Scalar values having floating-point data types (both real and complex) are allowed to downcast to a lower precision data type of the same kind (e.g., a scalar double-precision floating-point number can be used to fill a `'float32'` input ndarray).

-   The function **mutates** the input ndarray.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var discreteUniform = require( '@stdlib/random-discrete-uniform' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var fill = require( '@stdlib/ndarray-base-fill' );

var x = discreteUniform( [ 5, 2 ], -100, 100, {
    'dtype': 'generic'
});
console.log( ndarray2array( x ) );

fill( x, 10.0 );
console.log( ndarray2array( x ) );
```

</section>

<!-- /.examples -->

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<section class="related">

</section>

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<section class="main-repo" >

* * *

## 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 &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

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[umd]: https://github.com/umdjs/umd
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[deno-url]: https://github.com/stdlib-js/ndarray-base-fill/tree/deno
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/ndarray-base-fill/main/LICENSE

[@stdlib/ndarray/dtypes]: https://www.npmjs.com/package/@stdlib/ndarray-dtypes

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</section>

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