diff -r 000000000000 -r 0efde00f9229 mpc/gpc_ex11.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpc/gpc_ex11.py	Fri May 27 14:24:59 2011 +0530
@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# 12.1
+# Camacho and Bordon's GPC example; model formation
+import os, sys
+sys.path += [os.getcwdu() + os.sep + ".." + os.sep + "python"]
+
+import pylab as pl
+from xdync import xdync
+from polyfuncs import polmul
+
+A, dA = pl.array([1, -0.8]), 1
+B, dB = pl.array([0.4, 0.6]), 1
+N=3
+k=1
+D, dD = pl.array([1, -1]), 1
+AD, dAD = pl.convolve(A,D), dA+1
+Nu = N+k
+zj, dzj = 1, 0
+G = pl.zeros((Nu, 1))
+H1 = pl.zeros((Nu, k-1+dB))
+H2 = pl.zeros((Nu, dA+1))
+
+for j in range(Nu):
+    zj = pl.convolve(zj, [0,1])
+    dzj = dzj + 1
+    Fj, dFj, Ej, dEj = xdync(zj, dzj, AD, dAD, 1, 0)[:4]
+    Gj, dGj = polmul(B, dB, Ej, dEj)
+    m, n = G.shape
+    G = pl.column_stack((G, pl.zeros((m, dGj-n))))
+    G[j, :dGj] = Gj[dGj-1::-1]
+    H1[j,:k-1+dB] = Gj[dGj:dGj+k-1+dB]
+    H2[j,0:dA+1] = Fj
+
+print "G"
+print G
+print "H1"
+print H1
+print "H2"
+print H2