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+//Example 3.17
+clear;
+clc;
+no = 2; //Assume the amount of time shift  =2
+L = 10; //Length of given  signal
+for n = 1:L
+    x(n)=sin(n);
+    y(n)=-sin(n);
+  end
+ 
+//First shift the input signal only
+Input_shift = x(L-no);
+Output_shift = y(L-no);
+if(Input_shift == Output_shift)
+  disp('The given discrete system is a Time In-variant system');
+else
+  disp('The given discrete system is a Time Variant system');
+end