# rot180
> Return a **read-only** view of an input ndarray rotated `180` degrees in a specified plane.
## Usage
```javascript
var rot180 = require( '@stdlib/ndarray/rot180' );
```
#### rot180( x\[, options] )
Returns a read-only view of an input [`ndarray`][@stdlib/ndarray/ctor] rotated `180` degrees in a specified plane.
```javascript
var array = require( '@stdlib/ndarray/array' );
var x = array( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
var y = rot180( x );
// returns [ [ 4.0, 3.0 ], [ 2.0, 1.0 ] ]
```
The function accepts the following arguments:
- **x**: input [`ndarray`][@stdlib/ndarray/ctor].
- **options**: function options.
The function accepts the following options:
- **dims**: dimension indices defining the plane of rotation. Must contain exactly two unique dimension indices. If a dimension index is provided as 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: `[-2, -1]`.
## Notes
- Each provided dimension index must reside on the interval `[-ndims, ndims-1]`.
## Examples
```javascript
var uniform = require( '@stdlib/random/uniform' );
var ndarray2array = require( '@stdlib/ndarray/to-array' );
var rot180 = require( '@stdlib/ndarray/rot180' );
var x = uniform( [ 3, 3, 3 ], -10.0, 10.0 );
console.log( ndarray2array( x ) );
var y = rot180( x );
console.log( ndarray2array( y ) );
```
[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/ndarray/tree/main/ctor