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+//Scilab Code for Example 7.4 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear x y1 y y2 q t n;
+clear;
+//y(t)=x(2*t)
+disp('y(t) depends upon past inputs for t<0');
+disp('y(t) depends upon future inputs for t>0');
+disp('Hence the system is Dynamic');
+x1=[1,3,5,7,2,5,3,9];//Random Variable
+x2=[2,4,6,8,2,4,2,1];
+for t=1:4
+    y1(1,t)=x1(2*t);
+    y2(1,t)=x2(2*t);
+end
+b1=2;
+b2=3;
+x=b1*x1+b2*x2;
+disp(x,'The input to the system is:');
+for t=1:4
+    q(1,t)=x(2*t);
+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('Hence the system is linear');
+disp('For a delay (T) of 2 seconds');
+disp('At t=3 seconds:');
+t=3;
+a=x(1,2*t-2);
+b=y(1,t-2);
+c=x(1,2*t-4);
+disp(a,'x(2t-T):');
+disp(b,'is not equal to y(2t-T):');
+disp(c,'while x(2t-2*T):');
+disp('Hence the system is Time variant');