# isSkewPersymmetricMatrix
> Test if a value is a [skew-persymmetric matrix][persymmetric-matrix].
## Usage
```javascript
var isSkewPersymmetricMatrix = require( '@stdlib/assert/is-skew-persymmetric-matrix' );
```
#### isSkewPersymmetricMatrix( value )
Tests if a value is a [skew-persymmetric matrix][persymmetric-matrix].
```javascript
var ndarray = require( '@stdlib/ndarray/ctor' );
var arr = ndarray( 'generic', [ 2, 0, 0, -2 ], [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
var bool = isSkewPersymmetricMatrix( arr );
// returns true
```
## Examples
```javascript
var ndarray = require( '@stdlib/ndarray/ctor' );
var isSkewPersymmetricMatrix = require( '@stdlib/assert/is-skew-persymmetric-matrix' );
var arr = ndarray( 'generic', [ 1, 0, 0, -1 ], [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
var out = isSkewPersymmetricMatrix( arr );
// returns true
out = isSkewPersymmetricMatrix( [ 1, 2, 3, 4 ] );
// returns false
out = isSkewPersymmetricMatrix( {} );
// returns false
out = isSkewPersymmetricMatrix( null );
// returns false
```
[persymmetric-matrix]: https://en.wikipedia.org/wiki/Persymmetric_matrix