{{alias}}( shape )
    Returns the number of singleton dimensions.

    A singleton dimension is a dimension whose size is equal to `1`.

    Parameters
    ----------
    shape: Array<integer>
        Array shape.

    Returns
    -------
    n: integer
        Number of singleton dimensions.

    Examples
    --------
    > var n = {{alias}}( [ 3, 1, 3 ] )
    1

    See Also
    --------