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+//Scilab Code for Example 7.19 of Signals and systems by

+//P.Ramakrishna Rao

+//Convolution of two signals

+clc;

+clear;

+clear x y n;

+x=[2,-1,1,0,2];

+y=[1,0,-1,2];

+n=-1:3;

+c = gca();

+c.y_location = "origin";

+c.x_location = "origin";

+plot2d3(n,x,-5);

+title('x(k)')

+xlabel('k')

+figure(1);

+n=0:3;

+c = gca();

+c.y_location = "origin";

+c.x_location = "origin";

+plot2d3(n,y,-5);

+title('y(k)')

+xlabel('k')

+z=conv(x,y);

+figure(2);

+n=-1:6;

+c = gca();

+c.y_location = "origin";

+c.x_location = "origin";

+plot2d3(n,z,-5);

+title('Convoluted signal     z(t)')

+xlabel('t')