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

Arrays.

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# quaternary2d

> Apply a quaternary callback to elements in four two-dimensional 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 quaternary2d = require( '@stdlib/array/base/quaternary2d' );
```

#### quaternary2d( arrays, shape, fcn )

Applies a quaternary callback to elements in four two-dimensional 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 ], [ 3.0, 4.0 ] ];
var out = zeros2d( [ 2, 2 ] );

var shape = [ 2, 2 ];

quaternary2d( [ x, x, x, x, out ], shape, add );
// out => [ [ 4.0, 8.0 ], [ 12.0, 16.0 ] ]
```

The function accepts the following arguments:

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

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<section class="notes">

## Notes

-   The function assumes that the input and output arrays have the same shape.

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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 quaternary2d = require( '@stdlib/array/base/quaternary2d' );

var shape = [ 3, 3 ];

var x = filled2dBy( shape, discreteUniform( -100, 100 ) );
console.log( x );

var y = filled2dBy( shape, discreteUniform( -100, 100 ) );
console.log( y );

var z = filled2dBy( shape, discreteUniform( -100, 100 ) );
console.log( z );

var w = filled2dBy( shape, discreteUniform( -100, 100 ) );
console.log( w );

var out = zeros2d( shape );
console.log( out );

quaternary2d( [ x, y, z, w, out ], shape, add );
console.log( out );
```

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