{{alias}}( idx, max )
    Normalizes an index to the interval [0,max].

    If an index exceeds index bounds, the function returns -1.

    Parameters
    ----------
    idx: integer
        Index to normalize.

    max: integer
        Maximum index value.

    Returns
    -------
    out: integer
        Normalized index.

    Examples
    --------
    > var idx = {{alias}}( 2, 10 )
    2
    > idx = {{alias}}( -5, 10 )
    6
    > idx = {{alias}}( 15, 10 )
    -1

    See Also
    --------