Module « scipy.spatial.distance »

Fonction cosine - module scipy.spatial.distance

Signature de la fonction cosine

def cosine(u, v, w=None) 

Description

cosine.__doc__

    Compute the Cosine distance between 1-D arrays.

    The Cosine distance between `u` and `v`, is defined as

    .. math::

        1 - \frac{u \cdot v}
                  {||u||_2 ||v||_2}.

    where :math:`u \cdot v` is the dot product of :math:`u` and
    :math:`v`.

    Parameters
    ----------
    u : (N,) array_like
        Input array.
    v : (N,) array_like
        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
    -------
    cosine : double
        The Cosine distance between vectors `u` and `v`.

    Examples
    --------
    >>> from scipy.spatial import distance
    >>> distance.cosine([1, 0, 0], [0, 1, 0])
    1.0
    >>> distance.cosine([100, 0, 0], [0, 1, 0])
    1.0
    >>> distance.cosine([1, 1, 0], [0, 1, 0])
    0.29289321881345254