Create an array filled with ones and having a specified length.
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> Create an array filled with ones and having a specified length.
``bash`
npm install @stdlib/array-ones
`javascript`
var ones = require( '@stdlib/array-ones' );
#### ones( length\[, dtype] )
Creates an array filled with ones and having a specified length.
`javascript`
var arr = ones( 2 );
// returns
The function recognizes the following data types:
- float64: double-precision floating-point numbers (IEEE 754)float32
- : single-precision floating-point numbers (IEEE 754)complex128
- : double-precision complex floating-point numberscomplex64
- : single-precision complex floating-point numbersint32
- : 32-bit two's complement signed integersuint32
- : 32-bit unsigned integersint16
- : 16-bit two's complement signed integersuint16
- : 16-bit unsigned integersint8
- : 8-bit two's complement signed integersuint8
- : 8-bit unsigned integersuint8c
- : 8-bit unsigned integers clamped to 0-255
- : generic JavaScript values
By default, the output array data type is float64 (i.e., a [typed array][mdn-typed-array]). To specify an alternative data type, provide a dtype argument.
`javascript`
var arr = ones( 2, 'int32' );
// returns
- For complex number arrays, each entry of the returned array has a real component equal to 1 and an imaginary component equal to 0.
`javascript
var dtypes = require( '@stdlib/array-dtypes' );
var ones = require( '@stdlib/array-ones' );
// Get a list of array data types:
var dt = dtypes();
// Generate filled arrays...
var arr;
var i;
for ( i = 0; i < dt.length; i++ ) {
arr = ones( 4, dt[ i ] );
console.log( arr );
}
`
*
- [@stdlib/array-full][@stdlib/array/full]: create a filled array having a specified length.
- [@stdlib/array-nans][@stdlib/array/nans]: create an array filled with NaNs and having a specified length.
- [@stdlib/array-ones-like][@stdlib/array/ones-like]: create an array filled with ones and having the same length and data type as a provided array.
- [@stdlib/array-zeros][@stdlib/array/zeros]: create a zero-filled array having a specified length.
*
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].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[npm-url]: https://npmjs.org/package/@stdlib/array-ones
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[test-url]: https://github.com/stdlib-js/array-ones/actions/workflows/test.yml?query=branch:v0.2.2
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[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/array-ones/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-ones/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-ones/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-ones/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-ones/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-ones/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-ones/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-ones/main/LICENSE
[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
[@stdlib/array/full]: https://www.npmjs.com/package/@stdlib/array-full
[@stdlib/array/nans]: https://www.npmjs.com/package/@stdlib/array-nans
[@stdlib/array/ones-like]: https://www.npmjs.com/package/@stdlib/array-ones-like
[@stdlib/array/zeros]: https://www.npmjs.com/package/@stdlib/array-zeros