'Vectorize the upper triagonal entries.'

@AffAtom.numpy_numeric
def numeric(self, values):

    value = np.zeros(self.size[0])
    count = 0
    for i in range(values[0].shape[0]):
        for j in range(values[0].shape[1]):
            if (i < j):
                value[count] = values[0][(i, j)]
                count += 1
    return value
