'Calculate Bode magnitude and phase data of a discrete-time system.
Returns a 3-tuple containing arrays of frequencies [rad/s], magnitude
[dB] and phase [deg]. See `dbode` for details.
Examples
>>> from scipy import signal
>>> import matplotlib.pyplot as plt
Transfer function: H(z) = 1 / (z^2 + 2z + 3) with sampling time 0.5s
>>> sys = signal.TransferFunction([1], [1, 2, 3], dt=0.5)
Equivalent: signal.dbode(sys)
>>> w, mag, phase = sys.bode()
>>> plt.figure()
>>> plt.semilogx(w, mag)    # Bode magnitude plot
>>> plt.figure()
>>> plt.semilogx(w, phase)  # Bode phase plot
>>> plt.show()'

def bode(self, w=None, n=100):

    return dbode(self, w=w, n=n)
