#!/usr/bin/python
# 7.3
import os, sys
sys.path += [os.getcwdu() + os.sep + ".." + os.sep + "python"]

import pylab as pl
from scipy import signal
from bode import bode

pol1 = [1, -0.9]
pol2 = [1, -0.8]
G1 = signal.lti(pol1,[1, 0])
G2 = signal.lti(pol2,[1, 0])
w = pl.linspace(0.001,0.5,1000)
bode(G1, w)
bode(G2, w)
pl.figure()
G = signal.lti(pol1,pol2)
bode(G,w)

pl.show()