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+//Scilab Code for Example 7.6 of Signals and systems by

+//P.Ramakrishna Rao

+clc;

+clear x y1 y y2 q t n;

+clear;

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

+x=[2,4,3,6,7]

+for n=2:5

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

+end

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

+disp('For a shift (n0) of 2 seconds');

+disp('At n=3 seconds:');

+n=5;

+b=y(n-2);

+a=x(n-2)-x(n-2-1);

+disp(a,'x(n-2):');

+disp(b,'is equal to y(n-2):');

+disp('Hence the system is Shift invariant/fixed');

+