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+//Scilab Code for Example 7.7 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear x y1 y y2 q t n;
+clear;
+//y(t)=n*x(n)
+disp('y(n) depends only upon present inputs');
+disp('(i)    Hence the system is Dynamic');
+x1=[1,3,5,3,2,5,3,9];//random variable
+x2=[2,4,6,4,2,4,2,1];
+for n=1:4
+    y1(1,n)=n*x1(n);
+    y2(1,n)=n*x2(n);
+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)=n*x(n);
+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('(ii)    Hence the system is linear');
+disp('For a delay (n0) of 2 seconds');
+disp('At n=3 seconds:');
+t=3;
+a=x(1,n-2);
+b=y(1,n-2);
+c=2*x(1,n-2);
+disp(a,'x(n-n0):');
+disp(b,'is not equal to y(n-n0):');
+disp(c,'while (n-n0)*x(n-n0):');
+disp('(iii)    Hence the system is Time variant');