--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Z-trans/respol.py	Fri May 27 14:24:59 2011 +0530
@@ -0,0 +1,9 @@
+#!/usr/bin/python
+## 4.5
+
+from scipy import signal
+
+def respol(num,den):
+    if num[-1] == 0:
+        num = num[:-1]
+    return signal.residuez(num,den)[:-1]