Usage

var sswap = require( '@stdlib/blas-base-sswap' );

sswap( N, x, strideX, y, strideY )

Interchanges vectors x and y.

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
var y = new Float32Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );

sswap( x.length, x, 1, y, 1 );
// x => <Float32Array>[ 6.0, 7.0, 8.0, 9.0, 10.0 ]
// y => <Float32Array>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]

The function has the following parameters:

• N: number of values to swap.
• x: first input Float32Array.
• strideX: index increment for x.
• y: second input Float32Array.
• strideY: index increment for y.

The N and stride parameters determine how values from x and y are accessed at runtime. For example, to swap in reverse order every other value in x with the first N elements of y,

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y = new Float32Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );

sswap( 3, x, -2, y, 1 );
// x => <Float32Array>[ 9.0, 2.0, 8.0, 4.0, 7.0, 6.0 ]
// y => <Float32Array>[ 5.0, 3.0, 1.0, 10.0, 11.0, 12.0 ]

Note that indexing is relative to the first index. To introduce an offset, use typed array views.

var Float32Array = require( '@stdlib/array-float32' );

// Initial arrays...
var x0 = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y0 = new Float32Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );

// Create offset views...
var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float32Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element

// Swap in reverse order every other value from `x1` with `y1`...
sswap( 3, x1, -2, y1, 1 );
// x0 => <Float32Array>[ 1.0, 12.0, 3.0, 11.0, 5.0, 10.0 ]
// y0 => <Float32Array>[ 7.0, 8.0, 9.0, 6.0, 4.0, 2.0 ]

sswap.ndarray( N, x, strideX, offsetX, y, strideY, offsetY )

Interchanges vectors x and y using alternative indexing semantics.

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
var y = new Float32Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );

sswap.ndarray( x.length, x, 1, 0, y, 1, 0 );
// x => <Float32Array>[ 6.0, 7.0, 8.0, 9.0, 10.0 ]
// y => <Float32Array>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]

The function has the following additional parameters:

• offsetX: starting index for x.
• offsetY: starting index for y.

While typed array views mandate a view offset based on the underlying buffer, the offsetX and offsetY parameters support indexing semantics based on starting indices. For example, to swap every other value in x starting from the second value with the last N elements in y where x[i] = y[n], x[i+2] = y[n-1],...,

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y = new Float32Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );

sswap.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// x => <Float32Array>[ 1.0, 12.0, 3.0, 11.0, 5.0, 10.0 ]
// y => <Float32Array>[ 7.0, 8.0, 9.0, 6.0, 4.0, 2.0 ]