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+//Scilab Code for Example 7.8 of Signals and systems by

+//P.Ramakrishna Rao

+clc;

+clear x y1 y y2 q t n;

+clear;

+//y(t)=sum(x(n)),n-2<=n=<n+2

+x1=[1,3,5,3,0,0,0,0,0,0];//random variable

+x2=[2,4,6,4,0,0,0,0,0,0];

+for n=1:4

+    y1(1,n)=x1(n)+x1(n+1)+x1(n+2)+x1(n+3)+x1(n+4);

+    y2(1,n)=x2(n)+x2(n+1)+x2(n+2)+x2(n+3)+x2(n+4);

+end

+b1=2;

+b2=3;

+x=b1*x1+b2*x2;

+disp(x,'The input to the system is:');

+for n=1:4

+    q(1,n)=x(n)+x(n+1)+x(n+2)+x(n+3)+x(n+4);

+end

+disp(q,'This input gives the output:');

+y=b1*y1+b2*y2;

+disp(y,'For the system to be linear the output should be:');

+disp('(i)    Hence the system is linear');