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+//clear//

+//Example 1.12:Classification of system:Causality property

+//Page 47

+//To check whether the given discrete system is a Causal System (or) Non-Causal System

+//Given discrete system y[n]= x[-n]

+clear;

+clc;

+x = [2,4,6,8,10,0,0,0,1];  //Assign some value to input

+n = -length(x)/2:length(x)/2;

+count = 0;

+mid = ceil(length(x)/2);

+y = zeros(1,length(x));

+y(mid+1:$) = x($:-1:mid+1);

+for n = -1:-1:-mid

+  y(n+1+mid) = x(-n);

+end

+for i = 1:length(x)

+  if (y(i)==x(i))

+    count = count+1;

+  end

+end 

+if (count==length(x))

+    disp('The given system is a causal system')

+else

+    disp('Since it depends on future input value')

+    disp('The given system is a non-causal system')

+end