# gswap
> Interchange two vectors.
## Usage
```javascript
var gswap = require( '@stdlib/blas/gswap' );
```
#### gswap( x, y )
Interchanges two vectors `x` and `y`.
```javascript
var Float64Array = require( '@stdlib/array/float64' );
var array = require( '@stdlib/ndarray/array' );
var x = array( new Float64Array( [ 4.0, 2.0, -3.0, 5.0, -1.0 ] ) );
var y = array( new Float64Array( [ 2.0, 6.0, -1.0, -4.0, 8.0 ] ) );
gswap( x, y );
var xbuf = x.data;
// returns [ 2.0, 6.0, -1.0, -4.0, 8.0 ]
var ybuf = y.data;
// returns [ 4.0, 2.0, -3.0, 5.0, -1.0 ]
```
The function has the following parameters:
- **x**: a 1-dimensional [`ndarray`][@stdlib/ndarray/array] or an array-like object.
- **y**: a 1-dimensional [`ndarray`][@stdlib/ndarray/array] or an array-like object.
## Notes
- `gswap()` provides a higher-level interface to the [BLAS][blas] level 1 function [`gswap`][@stdlib/blas/base/gswap].
- In general, for best performance, especially for large vectors, provide 1-dimensional [`ndarrays`][@stdlib/ndarray/array] whose underlying data type is either `float64` or `float32`.
## Examples
```javascript
var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var gswap = require( '@stdlib/blas/gswap' );
var rand1 = discreteUniform.factory( 0, 100 );
var rand2 = discreteUniform.factory( 0, 10 );
var x = [];
var y = [];
var i;
for ( i = 0; i < 10; i++ ) {
x.push( rand1() );
y.push( rand2() );
}
console.log( x );
console.log( y );
gswap( x, y );
console.log( x );
console.log( y );
```
[blas]: http://www.netlib.org/blas
[@stdlib/blas/base/gswap]: https://www.npmjs.com/package/@stdlib/blas/tree/main/base/gswap
[@stdlib/ndarray/array]: https://www.npmjs.com/package/@stdlib/ndarray-array