--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Z-trans/division.py	Fri May 27 14:24:59 2011 +0530
@@ -0,0 +1,15 @@
+#!/usr/bin/python
+## 4.11
+
+import scipy as sp
+from scipy import signal
+
+num = sp.array([11,-15,6])
+den = signal.convolve([1,-2],signal.convolve([1,-1],[1,-1]))
+u = sp.zeros(5)
+u[0] = 1
+y = signal.lfilter(num,den,u)
+
+print num, den
+
+#Plot of impulse response???