
{{alias}}( N, k, fill, clbk[, thisArg] )
    Returns a filled two-dimensional symmetric banded nested array according to
    a provided callback function.

    The callback function is provided one argument:

    - indices: current array element indices.

    As the output array is banded and symmetric, the provided callback is only
    invoked for elements within the band in the upper triangle.

    Parameters
    ----------
    N: integer
        Number of rows and columns.

    k: integer
        Number of super-/sub-diagonals.

    fill: any
        Fill value for elements outside the band.

    clbk: Function
        Callback function.

    thisArg: any (optional)
        Callback execution context.

    Returns
    -------
    out: Array
        Output array.

    Examples
    --------
    > function clbk( idx ) { return idx[ 0 ] + idx[ 1 ]; };
    > var out = {{alias}}( 3, 1, 0, clbk )
    [ [ 0, 1, 0 ], [ 1, 2, 3 ], [ 0, 3, 4 ] ]

    See Also
    --------

