Usage

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

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

Computes the [multiplicative inverse][@stdlib/math/base/special/inv] 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( [ -20.0, -1.0, 2.0, 4.0, 10.0 ] );

// Perform operation in-place:
dinv( x.length, x, 1, x, 1 );
// x => [ -0.05, -1.0, 0.5, 0.25, 0.1 ]
`

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 x = new Float64Array( [ -20.0, -1.0, 2.0, 4.0, 10.0, 100.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dinv( 3, x, 2, y, -1 );
// y => [ 0.1, 0.5, -0.05, 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' );

// Initial arrays...
var x0 = new Float64Array( [ -20.0, -1.0, 2.0, 4.0, 10.0, 100.0 ] );
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

dinv( 3, x1, -2, y1, 1 );
// y0 => [ 0.0, 0.0, 0.0, 0.01, 0.25, -1.0 ]
`

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

Computes the [multiplicative inverse][@stdlib/math/base/special/inv] 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( [ -20.0, -1.0, 2.0, 4.0, 10.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dinv.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => [ -0.05, -1.0, 0.5, 0.25, 0.1 ]
`

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 x = new Float64Array( [ -20.0, -1.0, 2.0, 4.0, 10.0, 100.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

dinv.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => [ 0.0, 0.0, 0.0, 0.01, 0.25, -1.0 ]
`