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+//Example 10.8
+// Pole-Zero Pattern of a Fifth Order Network
+s=poly(0,'s')
+num=s^4+16*s^3+164*s^2;
+K=-5;
+den=(s+32)*(s^2+36)*(s^2+40*s+400)
+H=(num*K)/den;// transfer functions
+z=roots(num); // zeros of network
+p=roots(den);// poles of network
+disp(z,"Zeros of network functions=")
+disp(p,"Poles of network functions=")