Module « scipy.spatial.distance »

Fonction yule - module scipy.spatial.distance

Signature de la fonction yule

def yule(u, v, w=None) 

Description

yule.__doc__

    Compute the Yule dissimilarity between two boolean 1-D arrays.

    The Yule dissimilarity is defined as

    .. math::

         \frac{R}{c_{TT} * c_{FF} + \frac{R}{2}}

    where :math:`c_{ij}` is the number of occurrences of
    :math:`\mathtt{u[k]} = i` and :math:`\mathtt{v[k]} = j` for
    :math:`k < n` and :math:`R = 2.0 * c_{TF} * c_{FT}`.

    Parameters
    ----------
    u : (N,) array_like, bool
        Input array.
    v : (N,) array_like, bool
        Input array.
    w : (N,) array_like, optional
        The weights for each value in `u` and `v`. Default is None,
        which gives each value a weight of 1.0

    Returns
    -------
    yule : double
        The Yule dissimilarity between vectors `u` and `v`.

    Examples
    --------
    >>> from scipy.spatial import distance
    >>> distance.yule([1, 0, 0], [0, 1, 0])
    2.0
    >>> distance.yule([1, 1, 0], [0, 1, 0])
    0.0