4afdc53218ffc1356c008ef2e4a3c4c5d4f1795e,scipy/signal/tests/test_filter_design.py,TestButtord,test_bandpass,#TestButtord#,171

Before Change

        assert_allclose(Wn, 2.994397774822765e-01, rtol=1e-15)

    def test_bandpass(self):
        n, Wn = buttord([0.2, 0.5], [0.1, 0.6], 3, 80)
        assert_equal(n, 18)
        assert_allclose(Wn, [1.988019498910527e-01, 5.020435331649425e-01],
                        rtol=1e-15)

After Change

        ws = [0.1, 0.6]
        rp = 3
        rs = 80
        N, Wn = buttord(wp, ws, rp, rs, False)
        b, a = butter(N, Wn, "bandpass", False)
        w, h = freqz(b, a)
        w /= np.pi
        assert_array_less(-rp - 0.1,
                          dB(h[np.logical_and(wp[0] <= w, w <= wp[1])]))

Instances