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+//Example 7.13
+//Zeros for the Thermal System from a State Description
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+// State space model of the given system
+F=[-7 -12; 1 0];
+G=[1;0];
+H=[1 2];
+J=0;
+sysG=syslin('c',F,G,H,J)
+//------------------------------------------------------------------
+//Transfer function model
+[d num den]=ss2tf(sysG);
+zr=roots(num);
+disp(zr,'zr=');
+//Alternately, it can be obtained as
+zr=trzeros(sysG);
+disp(zr,'zr=');
+//------------------------------------------------------------------
+
+