{{alias}}( idx, max, mode )
    Returns an index given an index mode.

    Parameters
    ----------
    idx: integer
        Index.

    max: integer
        Maximum index value.

    mode: string
        Specifies how to handle an index outside the interval [0,max]. If equal
        to 'throw', the function throws an error. If equal to 'wrap', the
        function wraps around an index using modulo arithmetic. If equal to
        'clamp', the function sets an index to either `0` (minimum index) or the
        maximum index.

    Returns
    -------
    out: integer
        Index.

    Examples
    --------
    > var idx = {{alias}}( 2, 10, 'throw' )
    2
    > idx = {{alias}}( 2, 10, 'wrap' )
    2
    > idx = {{alias}}( -4, 10, 'wrap' )
    7
    > idx = {{alias}}( 13, 10, 'wrap' )
    2
    > idx = {{alias}}( 2, 10, 'clamp' )
    2
    > idx = {{alias}}( -4, 10, 'clamp' )
    0
    > idx = {{alias}}( 13, 10, 'clamp' )
    10

    See Also
    --------