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+//Scilab Code for Example 7.22 of Signals and systems by
+//P.Ramakrishna Rao
+//Convolution of two signals
+clc;
+clear;
+clear x y n;
+for n=0:10;
+    x(n+1)=(3/4)^n*u(n);
+end
+c = gca();
+c.y_location = "origin";
+c.x_location = "origin";
+n=0:10;
+plot2d3(n,x,-4);
+title('x(n)')
+xlabel('n')
+for n=0:10;
+    y(n+1)=u(n);
+end
+figure(1);
+n=0:10;
+c = gca();
+c.y_location = "origin";
+c.x_location = "origin";
+plot2d3(n,y,-4);
+title('y(k)')
+xlabel('k')
+z=conv(x,y);
+figure(2);
+n=0:20;
+c = gca();
+c.y_location = "origin";
+c.x_location = "origin";
+plot2d3(n,z,-4);
+title('Convoluted signal     w(t)');
+xlabel('t');
+disp(z(1),'z(0)',z(4),'z(3)',z(6),'z(5)',z(11),'z(10)');