def METHOD_NAME(self):
    w = wavelets.ricker(1.0, 1)
    expected = 2 / (np.sqrt(3 * 1.0) * (np.pi ** 0.25))
    assert_array_equal(w, expected)
    lengths = [5, 11, 15, 51, 101]
    for length in lengths:
        w = wavelets.ricker(length, 1.0)
        assert_(len(w) == length)
        max_loc = np.argmax(w)
        assert_(max_loc == (length // 2))
    points = 100
    w = wavelets.ricker(points, 2.0)
    half_vec = np.arange(0, points // 2)
    #Wavelet should be symmetric
    assert_array_almost_equal(w[half_vec], w[-(half_vec + 1)])
    #Check zeros
    aas = [5, 10, 15, 20, 30]
    points = 99
    for a in aas:
        w = wavelets.ricker(points, a)
        vec = np.arange(0, points) - (points - 1.0) / 2
        exp_zero1 = np.argmin(np.abs(vec - a))
        exp_zero2 = np.argmin(np.abs(vec + a))
        assert_array_almost_equal(w[exp_zero1], 0)
        assert_array_almost_equal(w[exp_zero2], 0)