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+//Example 7.8
+//Time scaling an oscillator.
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+// State space model of an oscillator
+wn=15000 // rad/sec
+F=[0 1;wn^2 0];
+G=[0;10^6];
+disp(G,"G",F,"F","Given system");
+
+//------------------------------------------------------------------
+// State space model of the time-scaled system for 
+// a millisecond scale w0=1e3;
+w0=1e3; //rad/sec
+F1=F/w0;
+G1=G/w0;
+disp(G1,"G1",F1,"F1","Time scaled system in mm");
+//------------------------------------------------------------------