npm package: @stdlib/ndarray-pop
Description: Return an array containing a read-only truncated view of an input ndarray and a read-only view of the last element(s) along a specified dimension.
Author: The Stdlib Authors
Latest version: 0.1.1

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  <summary>
    About stdlib...
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# pop

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> Return an array containing a read-only truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] and a read-only view of the last element(s) along a specified dimension.

<!-- 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-pop
```

</section>

<section class="usage">

## Usage

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

#### pop( x\[, options] )

Returns an array containing a **read-only** truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] and a **read-only** view of the last element(s) along a specified dimension.

```javascript
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );

var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ], {
    'shape': [ 3, 2 ]
});
// returns <ndarray>

var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]

var y = pop( x );
// returns [ <ndarray>, <ndarray> ]

arr = ndarray2array( y[ 0 ] );
// returns [ [ 1.0 ], [ 3.0 ], [ 5.0 ] ]

arr = ndarray2array( y[ 1 ] );
// returns [ [ 2.0 ], [ 4.0 ], [ 6.0 ] ]
```

The function accepts the following arguments:

-   **x**: input ndarray. Must have one or more dimensions.
-   **options**: function options. (_optional_)

The function supports the following `options`:

-   **dim**: dimension along which to perform the operation. If provided an integer less than zero, the dimension index is resolved relative to the last dimension, with the last dimension corresponding to the value `-1`. Default: `-1`.

By default, the function performs the operation along the last dimension of the input [ndarray][@stdlib/ndarray/ctor]. To perform the operation along a specific dimension, specify the `dim` option.

```javascript
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );

var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ], {
    'shape': [ 3, 2 ]
});
// returns <ndarray>

var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]

var opts = {
    'dim': 0
};

var y = pop( x, opts );
// returns [ <ndarray>, <ndarray> ]

arr = ndarray2array( y[ 0 ] );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]

arr = ndarray2array( y[ 1 ] );
// returns [ [ 5.0, 6.0 ] ]
```

</section>

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</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var zeroTo = require( '@stdlib/array-zero-to' );
var pop = require( '@stdlib/ndarray-pop' );

// Create an ndarray:
var x = array( zeroTo( 27 ), {
    'shape': [ 3, 3, 3 ]
});
console.log( ndarray2array( x ) );

// Remove the last column from each matrix:
var y = pop( x );

console.log( ndarray2array( y[ 0 ] ) );
console.log( ndarray2array( y[ 1 ] ) );
```

</section>

<!-- /.examples -->

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</section>

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</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].

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

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