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+//clear//
+//Example 1.17:Classification of system:Linearity Property
+//Page 54
+//To check whether the given discrete system is a Linear System (or) Non-Linear System
+//Given discrete system y(t)= t*x(t)
+clear;
+clc;
+x1 = [1,1,1,1];
+x2 = [2,2,2,2];
+a = 1;
+b = 1;
+for t = 1:length(x1)
+  x3(t) = a*x1(t)+b*x2(t);
+end
+for t = 1:length(x1)
+  y1(t) = t*x1(t);
+  y2(t) = t*x2(t);
+  y3(t) = t*x3(t);
+end
+for t = 1:length(y1)
+  z(t) = a*y1(t)+b*y2(t);
+end
+count = 0;
+for n =1:length(y1)
+  if(y3(t)== z(t))
+    count = count+1;
+  end
+end
+if(count == length(y3))
+   disp('Since It satisifies the superposition principle')
+   disp('The given system is a Linear system')
+   y3
+   z
+  else
+    disp('Since It does not satisify the superposition principle')
+    disp('The given system is a Non-Linear system')
+end