def __init__(self, b, a):
        self.b = a[0] / np.array(b)
        self.a = np.array(a[1:]) / a[0]
        self.x_state = [0] * len(self.b)
        self.y_state = [0] * (len(self.a) + 1)
dataset/ETHPy150Open romanz/amodem/amodem/tests/utils.py/IIR.__init__/swapped operands of `/`