4afdc53218ffc1356c008ef2e4a3c4c5d4f1795e,scipy/signal/tests/test_filter_design.py,TestButtord,test_lowpass,#TestButtord#,161

Before Change

class TestButtord(TestCase):

    def test_lowpass(self):
        n, Wn = buttord(0.2, 0.3, 3, 60)
        assert_equal(n, 16)
        assert_allclose(Wn, 2.034240543183123e-01, rtol=1e-15)

After Change

class TestButtord(TestCase):

    def test_lowpass(self):
        wp = 0.2
        ws = 0.3
        rp = 3
        rs = 60
        N, Wn = buttord(wp, ws, rp, rs, False)
        b, a = butter(N, Wn, "lowpass", False)
        w, h = freqz(b, a)
        w /= np.pi
        assert_array_less(-rp - 0.1, dB(h[w <= wp]))

Instances