1 #!/usr/bin/python

     2 ## 4.7

     3 

     4 from respol import respol

     5 

     6 import scipy as sp

     7 from scipy import signal

     8 

     9 num = sp.array([1,1,0])

    10 den = signal.convolve([1,-1],signal.convolve([1,-1],[1,-1]))

    11 

    12 res, pol = respol(num,den)