npm package: @stdlib/ndarray-slice-dimension-to
Description: Return a read-only truncated view of an input ndarray along a specific dimension.
Author: The Stdlib Authors
Latest version: 0.2.4

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# sliceDimensionTo

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> Return a read-only truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] 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-slice-dimension-to
```

</section>

<section class="usage">

## Usage

```javascript
var sliceDimensionTo = require( '@stdlib/ndarray-slice-dimension-to' );
```

#### sliceDimensionTo( x, dim, stop\[, options] )

Returns a **read-only** truncated view of an input [`ndarray`][@stdlib/ndarray/ctor] along a specified dimension.

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

var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 3, 2 ];
var strides = [ 2, 1 ];
var offset = 0;

var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
// returns <ndarray>

var sh = x.shape;
// returns [ 3, 2 ]

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

var y = sliceDimensionTo( x, 0, 2 );
// returns <ndarray>

sh = y.shape;
// returns [ 2, 2 ]

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

The function accepts the following arguments:

-   **x**: input [`ndarray`][@stdlib/ndarray/ctor].
-   **dim**: index of dimension along which to slice. 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`.
-   **stop**: ending index (exclusive). If provided an integer less than zero, the corresponding element along the specified dimension is resolved relative to the last element along that dimension. For negative integers, the last element corresponds to the value `-1`.
-   **options**: function options.

The function supports the following `options`:

-   **strict**: boolean indicating whether to enforce strict bounds checking.

By default, the function throws an error when provided an ending index which exceeds array bounds. To return an empty array when an ending index exceeds array bounds, set the `strict` option to `false`.

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

var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 3, 2 ];
var strides = [ 2, 1 ];
var offset = 0;

var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
// returns <ndarray>

var sh = x.shape;
// returns [ 3, 2 ]

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

var y = sliceDimensionTo( x, 1, -20, {
    'strict': false
});
// returns <ndarray>

sh = y.shape;
// returns [ 3, 0 ]

arr = ndarray2array( y );
// returns []
```

</section>

<!-- /.usage -->

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<section class="notes">

</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-base-zero-to' );
var sliceDimensionTo = require( '@stdlib/ndarray-slice-dimension-to' );

// Create a linear ndarray buffer:
var buf = zeroTo( 27 );

// Create an ndarray:
var x = array( buf, {
    'shape': [ 3, 3, 3 ]
});

// Get the first two rows of each matrix:
var y1 = sliceDimensionTo( x, 1, 2 );
// returns <ndarray>

var a1 = ndarray2array( y1 );
// returns [ [ [ 0, 1, 2 ], [ 3, 4, 5 ] ], [ [ 9, 10, 11 ], [ 12, 13, 14 ] ], [ [ 18, 19, 20 ], [ 21, 22, 23 ] ] ]

// Get the first columns of each matrix:
var y2 = sliceDimensionTo( x, 2, 2 );
// returns <ndarray>

var a2 = ndarray2array( y2 );
// returns [ [ [ 0, 1 ], [ 3, 4 ], [ 6, 7 ] ], [ [ 9, 10 ], [ 12, 13 ], [ 15, 16 ] ], [ [ 18, 19 ], [ 21, 22 ], [ 24, 25 ] ] ]

// Get the first two matrices:
var y3 = sliceDimensionTo( x, 0, 2 );
// returns <ndarray>

var a3 = ndarray2array( y3 );
// returns [ [ [ 0, 1, 2 ], [ 3, 4, 5 ], [ 6, 7, 8 ] ], [ [ 9, 10, 11 ], [ 12, 13, 14 ], [ 15, 16, 17 ] ] ]
```

</section>

<!-- /.examples -->

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</section>

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* * *

## 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>
-   <span class="package-name">[`@stdlib/ndarray-slice`][@stdlib/ndarray/slice]</span><span class="delimiter">: </span><span class="description">return a read-only view of an input ndarray.</span>
-   <span class="package-name">[`@stdlib/ndarray-slice-dimension`][@stdlib/ndarray/slice-dimension]</span><span class="delimiter">: </span><span class="description">return a read-only view of an input ndarray when sliced along a specified dimension.</span>
-   <span class="package-name">[`@stdlib/ndarray-slice-dimension-from`][@stdlib/ndarray/slice-dimension-from]</span><span class="delimiter">: </span><span class="description">return a read-only shifted view of an input ndarray along a specific dimension.</span>
-   <span class="package-name">[`@stdlib/ndarray-slice-to`][@stdlib/ndarray/slice-to]</span><span class="delimiter">: </span><span class="description">return a read-only truncated view of an input ndarray.</span>

</section>

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* * *

## Notice

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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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## License

See [LICENSE][stdlib-license].


## Copyright

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

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