Usage

`javascript
var dmskabs2 = require( '@stdlib/math-strided-special-dmskabs2' );
`

#### dmskabs2( N, x, sx, m, sm, y, sy )

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

`javascript
var Float64Array = require( '@stdlib/array-float64' );
var Uint8Array = require( '@stdlib/array-uint8' );

var x = new Float64Array( [ -2.0, 1.0, -3.0, -5.0, 4.0 ] );
var m = new Uint8Array( [ 0, 0, 1, 0, 1 ] );
var y = new Float64Array( x.length );

dmskabs2( x.length, x, 1, m, 1, y, 1 );
// y => [ 4.0, 1.0, 0.0, 25.0, 0.0 ]
`

The function accepts the following arguments:

- N: number of indexed elements.
- x: input [Float64Array][@stdlib/array/float64].
- sx: index increment for x.
- m: mask [Uint8Array][@stdlib/array/uint8].
- sm: index increment for m.
- y: output [Float64Array][@stdlib/array/float64].
- sy: index increment for y.

The N and stride parameters determine which strided array elements 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 Uint8Array = require( '@stdlib/array-uint8' );

var x = new Float64Array( [ -2.0, 1.0, -3.0, -5.0, 4.0, 0.0 ] );
var m = new Uint8Array( [ 0, 0, 1, 0, 1, 1 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dmskabs2( 3, x, 2, m, 2, y, -1 );
// y => [ 0.0, 0.0, 4.0, 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 Uint8Array = require( '@stdlib/array-uint8' );

// Initial arrays...
var x0 = new Float64Array( [ -2.0, 1.0, -3.0, -5.0, 4.0, 0.0 ] );
var m0 = new Uint8Array( [ 0, 0, 1, 0, 1, 1 ] );
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 m1 = new Uint8Array( m0.buffer, m0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element

dmskabs2( 3, x1, -2, m1, -2, y1, 1 );
// y0 => [ 0.0, 0.0, 0.0, 0.0, 25.0, 1.0 ]
`

#### dmskabs2.ndarray( N, x, sx, ox, m, sm, om, y, sy, oy )

Computes the [squared absolute value][@stdlib/math/base/special/abs2] for each element in a double-precision floating-point strided array x according to a strided mask array 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 Uint8Array = require( '@stdlib/array-uint8' );

var x = new Float64Array( [ -2.0, 1.0, -3.0, -5.0, 4.0 ] );
var m = new Uint8Array( [ 0, 0, 1, 0, 1 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dmskabs2.ndarray( x.length, x, 1, 0, m, 1, 0, y, 1, 0 );
// y => [ 4.0, 1.0, 0.0, 25.0, 0.0 ]
`

The function accepts the following additional arguments:

- ox: starting index for x.
- om: starting index for m.
- oy: starting index for y.

While [typed array][@stdlib/array/float64] views mandate a view offset based on the underlying buffer, the offset 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 Uint8Array = require( '@stdlib/array-uint8' );

var x = new Float64Array( [ -2.0, 1.0, -3.0, -5.0, 4.0, 0.0 ] );
var m = new Uint8Array( [ 0, 0, 1, 0, 1, 1 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dmskabs2.ndarray( 3, x, 2, 1, m, 2, 1, y, -1, y.length-1 );
// y => [ 0.0, 0.0, 0.0, 0.0, 25.0, 1.0 ]
`