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+//Example 1.27<a>
+//Determine whether the following system is time invariant or not
+clc;	
+clear all;	
+T =20;
+s =2;
+for n=1:T
+x(n)=n;
+y(n)=n*x(n);
+end
+IP=x(T-s);
+OP=y(T-s);
+if IP == OP then
+disp('The given system is time invariant');
+else
+disp('The given system is time variant');
+end