Usage

`javascript
var dabs2 = require( '@stdlib/math-strided-special-dabs2' );
`

#### dabs2( N, x, strideX, y, strideY )

Computes the [squared absolute value][@stdlib/math/base/special/abs2] for each element in a double-precision floating-point strided array x and assigns the results to elements in a double-precision floating-point strided array y.

`javascript
var Float64Array = require( '@stdlib/array-float64' );

var x = new Float64Array( [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ] );

// Compute the squared absolute values in-place:
dabs2( x.length, x, 1, x, 1 );
// x => [ 4.0, 1.0, 9.0, 25.0, 16.0, 0.0, 1.0, 9.0 ]
`

The function accepts the following arguments:

- N: number of indexed elements.
- x: input [Float64Array][@stdlib/array/float64].
- strideX: index increment for x.
- y: output [Float64Array][@stdlib/array/float64].
- strideY: index increment for y.

The N and stride parameters determine which elements in x and y are accessed at runtime. For example, to index every other value in x and to index the first N elements of y in reverse order,

`javascript
var Float64Array = require( '@stdlib/array-float64' );
var floor = require( '@stdlib/math-base-special-floor' );

var x = new Float64Array( [ -1.0, -2.0, -3.0, -4.0, -5.0, -6.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

var N = floor( x.length / 2 );

dabs2( N, x, 2, y, -1 );
// y => [ 25.0, 9.0, 1.0, 0.0, 0.0, 0.0 ]
`

Note that indexing is relative to the first index. To introduce an offset, use [typed array][@stdlib/array/float64] views.

`javascript
var Float64Array = require( '@stdlib/array-float64' );
var floor = require( '@stdlib/math-base-special-floor' );

// Initial arrays...
var x0 = new Float64Array( [ -1.0, -2.0, -3.0, -4.0, -5.0, -6.0 ] );
var y0 = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

// Create offset views...
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element

var N = floor( x0.length / 2 );

dabs2( N, x1, -2, y1, 1 );
// y0 => [ 0.0, 0.0, 0.0, 36.0, 16.0, 4.0 ]
`

#### dabs2.ndarray( N, x, strideX, offsetX, y, strideY, offsetY )

Computes the [squared absolute value][@stdlib/math/base/special/abs2] for each element in a double-precision floating-point strided array x and assigns the results to elements in a double-precision floating-point strided array y using alternative indexing semantics.

`javascript
var Float64Array = require( '@stdlib/array-float64' );

var x = new Float64Array( [ -1.0, -2.0, -3.0, -4.0, -5.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dabs2.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => [ 1.0, 4.0, 9.0, 16.0, 25.0 ]
`

The function accepts the following additional arguments:

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

While [typed array][@stdlib/array/float64] 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 index every other value in x starting from the second value and to index the last N elements in y,

`javascript
var Float64Array = require( '@stdlib/array-float64' );
var floor = require( '@stdlib/math-base-special-floor' );

var x = new Float64Array( [ -1.0, -2.0, -3.0, -4.0, -5.0, -6.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

var N = floor( x.length / 2 );

dabs2.ndarray( N, x, 2, 1, y, -1, y.length-1 );
// y => [ 0.0, 0.0, 0.0, 36.0, 16.0, 4.0 ]
`