@stdlib/array/base/broadcasted-quaternary2d/README.md

Arrays.

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# bquaternary2d

> Apply a quaternary callback to elements in four [broadcasted][@stdlib/array/base/broadcast-array] nested input arrays and assign results to elements in a two-dimensional nested output array.

<section class="intro">

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<section class="usage">

## Usage

```javascript
var bquaternary2d = require( '@stdlib/array/base/broadcasted-quaternary2d' );
```

#### bquaternary2d( arrays, shapes, fcn )

Applies a quaternary callback to elements in four [broadcasted][@stdlib/array/base/broadcast-array] nested input arrays and assigns results to elements in a two-dimensional nested output array.

```javascript
var add = require( '@stdlib/math/base/ops/add4' );
var zeros2d = require( '@stdlib/array/base/zeros2d' );

var x = [ [ 1.0, 2.0 ] ];
var y = [ [ 3.0 ], [ 4.0 ] ];
var z = [ [ 5.0 ] ];
var w = [ [ 2.0 ] ];
var out = zeros2d( [ 2, 2 ] );

var shapes = [
    [ 1, 2 ],
    [ 2, 1 ],
    [ 1, 1 ],
    [ 1, 1 ],
    [ 2, 2 ]
];

bquaternary2d( [ x, y, z, w, out ], shapes, add );
// out => [ [ 11.0, 12.0 ], [ 12.0, 13.0 ] ]
```

The function accepts the following arguments:

-   **arrays**: array-like object containing four input nested arrays and one output nested array.
-   **shapes**: array shapes.
-   **fcn**: quaternary function to apply.

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<section class="notes">

## Notes

-   The input and output array shapes must be broadcast [compatible][@stdlib/ndarray/base/broadcast-shapes].

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<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var discreteUniform = require( '@stdlib/random/base/discrete-uniform' ).factory;
var filled2dBy = require( '@stdlib/array/base/filled2d-by' );
var zeros2d = require( '@stdlib/array/base/zeros2d' );
var add = require( '@stdlib/math/base/ops/add4' );
var bquaternary2d = require( '@stdlib/array/base/broadcasted-quaternary2d' );

var shapes = [
    [ 1, 3 ],
    [ 3, 1 ],
    [ 1, 1 ],
    [ 3, 3 ],
    [ 3, 3 ]
];

var x = filled2dBy( shapes[ 0 ], discreteUniform( -100, 100 ) );
console.log( x );

var y = filled2dBy( shapes[ 1 ], discreteUniform( -100, 100 ) );
console.log( y );

var z = filled2dBy( shapes[ 2 ], discreteUniform( -100, 100 ) );
console.log( z );

var w = filled2dBy( shapes[ 3 ], discreteUniform( -100, 100 ) );
console.log( w );

var out = zeros2d( shapes[ 4 ] );
console.log( out );

bquaternary2d( [ x, y, z, w, out ], shapes, add );
console.log( out );
```

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</section>

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<section class="links">

[@stdlib/array/base/broadcast-array]: https://github.com/stdlib-js/array/tree/main/base/broadcast-array

[@stdlib/ndarray/base/broadcast-shapes]: https://www.npmjs.com/package/@stdlib/ndarray-base-broadcast-shapes

</section>

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