npm package: @stdlib/ndarray-base-shape
Description: Return the shape of a provided ndarray.
Author: The Stdlib Authors
Latest version: 0.2.3

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# shape

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> Return the shape of a provided [ndarray][@stdlib/ndarray/base/ctor].

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</section>

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<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### shape( x, copy )

Returns the shape of a provided [ndarray][@stdlib/ndarray/base/ctor].

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

var x = zeros( [ 3, 2, 3 ] );
// returns <ndarray>

var sh = shape( x, false );
// returns [ 3, 2, 3 ]
```

When `copy` is `false`, changes to the returned shape array may mutate the input [ndarray][@stdlib/ndarray/base/ctor] shape. If there is a chance that the returned shape will be mutated (either directly or by downstream consumers), set `copy` to `true` to prevent unintended side effects.

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

var x = zeros( [ 3, 2, 3 ] );
// returns <ndarray>

var sh = shape( x, true );
// returns [ 3, 2, 3 ]

var bool = ( x.shape === sh );
// returns false
```

</section>

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<section class="examples">

## Examples

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

<!-- eslint-disable new-cap -->

```javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var slice = require( '@stdlib/ndarray-slice' );
var E = require( '@stdlib/slice-multi' );
var S = require( '@stdlib/slice-ctor' );
var shape = require( '@stdlib/ndarray-base-shape' );

// Create an array:
var x = zeros( [ 10, 10, 10, 10 ] );
// returns <ndarray>

// Define some slices:
var slices = [
    // :,:,:,:
    E( null, null, null, null ),

    // 5:10,4,2:4,::-1
    E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),

    // :,:,2,:
    E( null, null, 2, null ),

    // 1,2,3,:
    E( 1, 2, 3, null ),

    // 1,3,::2,4::2
    E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
];

// Determine the shape of each slice...
var s;
var i;
for ( i = 0; i < slices.length; i++ ) {
    s = slice( x, slices[ i ] );
    console.log( 'slice(%s) => %s', x.shape.join( 'x' ), shape( s, false ).join( 'x' ) );
}
```

</section>

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* * *

## 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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[npm-url]: https://npmjs.org/package/@stdlib/ndarray-base-shape

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

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

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