
{{alias}}( 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.

    Parameters
    ----------
    arrays: ArrayLikeObject
        Array-like object containing four input nested arrays and one output
        nested array.

    shape: Array<integer>
        Array shape.

    fcn: Function
        Quaternary callback.

    Examples
    --------
    > function fcn( x, y, z, w ) { return x + y + z + w; };
    > var x = [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ];
    > var y = [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ];
    > var z = [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ];
    > var w = [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ];
    > var out = [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ];
    > var shape = [ 2, 2 ];
    > {{alias}}( [ x, y, z, w, out ], shape, fcn );
    > out
    [ [ 4.0, 8.0 ], [ 12.0, 16.0 ] ]

    See Also
    --------

