__init__.py 文件源码

def gower_matrix(X):
    """
    Gower, J.C. (1966). Some distance properties of latent root
    and vector methods used in multivariate analysis.
    Biometrika 53: 325-338

    @param X: ensemble coordinates
    @type X: (m,n,k) numpy.array

    @return: symmetric dissimilarity matrix
    @rtype: (n,n) numpy.array
    """
    X = numpy.asarray(X)

    B = sum(numpy.dot(x, x.T) for x in X) / float(len(X))
    b = B.mean(1)
    bb = b.mean()

    return (B - numpy.add.outer(b, b)) + bb