npm package: @stdlib/ndarray-from-scalar
Description: Convert a scalar value to a zero-dimensional ndarray.
Author: The Stdlib Authors
Latest version: 0.3.1

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# scalar2ndarray

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> Convert a scalar value to a zero-dimensional [ndarray][@stdlib/ndarray/ctor].

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/ndarray-from-scalar
```

</section>

<section class="usage">

## Usage

```javascript
var scalar2ndarray = require( '@stdlib/ndarray-from-scalar' );
```

#### scalar2ndarray( value\[, options] )

Returns a zero-dimensional [`ndarray`][@stdlib/ndarray/ctor] containing a provided scalar `value`.

```javascript
var x = scalar2ndarray( 1.0 );
// returns <ndarray>

var sh = x.shape;
// returns []

var dt = x.dtype;
// returns 'float64'

var v = x.get();
// returns 1.0
```

The function accepts the following `options`:

-   **dtype**: output array [data type][@stdlib/ndarray/dtypes].
-   **order**: array order (i.e., memory layout), which is either `row-major` (C-style) or `column-major` (Fortran-style). Default: `'row-major'`.
-   **readonly**: `boolean` indicating whether an array should be **read-only**. Default: `false`.

If a `dtype` option is not provided and `value`

-   is a number, the default [data type][@stdlib/ndarray/dtypes] is the [default][@stdlib/ndarray/defaults] real-valued floating-point data type.
-   is a boolean, the default [data type][@stdlib/ndarray/dtypes] is the [default][@stdlib/ndarray/defaults] boolean data type.
-   is a complex number object of a known data type, the data type is the same as the provided value.
-   is a complex number object of an unknown data type, the default [data type][@stdlib/ndarray/dtypes] is the [default][@stdlib/ndarray/defaults] complex-valued floating-point data type.
-   is any other value type, the default [data type][@stdlib/ndarray/dtypes] is `'generic'`.

To explicitly specify the [data type][@stdlib/ndarray/dtypes] of the returned [`ndarray`][@stdlib/ndarray/ctor], provide a `dtype` option.

```javascript
var x = scalar2ndarray( 1.0, {
    'dtype': 'float32'
});
// returns <ndarray>

var sh = x.shape;
// returns []

var dt = x.dtype;
// returns 'float32'

var v = x.get();
// returns 1.0
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   If `value` is a number and `options.dtype` is a complex [data type][@stdlib/ndarray/dtypes], the function returns a zero-dimensional [`ndarray`][@stdlib/ndarray/ctor] containing a complex number whose real component equals the provided scalar `value` and whose imaginary component is zero.
-   The function does not guard against precision loss when `value` is a number and the `dtype` argument is an integer [data type][@stdlib/ndarray/dtypes].

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var dtypes = require( '@stdlib/ndarray-dtypes' );
var scalar2ndarray = require( '@stdlib/ndarray-from-scalar' );

// Get a list of data types:
var dt = dtypes();

// Generate zero-dimensional arrays...
var x;
var i;
for ( i = 0; i < dt.length; i++ ) {
    x = scalar2ndarray( i, {
        'dtype': dt[ i ]
    });
    console.log( x.get() );
}
```

</section>

<!-- /.examples -->

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<section class="references">

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/ndarray-array`][@stdlib/ndarray/array]</span><span class="delimiter">: </span><span class="description">multidimensional arrays.</span>
-   <span class="package-name">[`@stdlib/ndarray-ctor`][@stdlib/ndarray/ctor]</span><span class="delimiter">: </span><span class="description">multidimensional array constructor.</span>

</section>

<!-- /.related -->

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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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

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

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

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

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