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# reverseDimension

> Return a view of an input ndarray in which the order of elements along a specified dimension is reversed.

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## Usage

```javascript
var reverseDimension = require( '@stdlib/ndarray/base/reverse-dimension' );
```

#### reverseDimension( x, dim, writable )

Returns a view of an input ndarray in which the order of elements along a specified dimension is reversed.

```javascript
var getShape = require( '@stdlib/ndarray/shape' );
var ndarray = require( '@stdlib/ndarray/ctor' );

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>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]

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

var y = reverseDimension( x, 0, false );
// returns <ndarray>[ [ 5.0, 6.0 ], [ 3.0, 4.0 ], [ 1.0, 2.0 ] ]

sh = getShape( y );
// returns [ 3, 2 ]
```

The function accepts the following arguments:

-   **x**: input ndarray.
-   **dim**: index of dimension along which to reverse elements. 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`.
-   **writable**: boolean indicating whether a returned ndarray should be writable.

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## Notes

-   The `writable` parameter **only** applies to ndarray constructors supporting **read-only** instances.

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## 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 reverseDimension = require( '@stdlib/ndarray/base/reverse-dimension' );

// Create a linear ndarray buffer:
var buf = zeroTo( 16 );

// Create a three-dimensional ndarray:
var x = array( buf, {
    'shape': [ 2, 4, 2 ]
});

// Reverse the order of first axis:
var y0 = reverseDimension( x, 0, false );
// returns <ndarray>

var a0 = ndarray2array( y0 );
// returns [ [ [ 8, 9 ], [ 10, 11 ], [ 12, 13 ], [ 14, 15 ] ], [ [ 0, 1 ], [ 2, 3 ], [ 4, 5 ], [ 6, 7 ] ] ]

// Reverse the order of second axis:
var y1 = reverseDimension( x, 1, false );
// returns <ndarray>

var a1 = ndarray2array( y1 );
// returns [ [ [ 6, 7 ], [ 4, 5 ], [ 2, 3 ], [ 0, 1 ] ], [ [ 14, 15 ], [ 12, 13 ], [ 10, 11 ], [ 8, 9 ] ] ]

// Reverse the order of third axis:
var y2 = reverseDimension( x, 2, false );
// returns <ndarray>

var a2 = ndarray2array( y2 );
// returns [ [ [ 1, 0 ], [ 3, 2 ], [ 5, 4 ], [ 7, 6 ] ], [ [ 9, 8 ], [ 11, 10 ], [ 13, 12 ], [ 15, 14 ] ] ]
```

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