clear all; close all;
warning('off','MATLAB:dispatcher:InexactMatch')
% 4th Homework 'DFT Examples'
% 	(a). Find & draw |X(omega)|, |H(omega)|, |Y(omega)|

x	=	[ 1, 2, 2, 1];
h	=	[ 1, 2, 3];
y	=	conv (x, h);

magX1	=	abs(hw4(x, length(x), 1));
magH1	=	abs(hw4(h, length(h), 1));
magY1	=	abs(hw4(y, length(y), 1));

figure('name', '(a) - |X(§Ù)|, |H(§Ù)|, |Y(§Ù)| & (b) - |X(k)|, |H(k)|, |Y(k)|', 'Position', [50, 50, 600, 600], 'MenuBar', 'none')
subplot(3,2,1); plot(magY1, 'DisplayName', 'magY1', 'YDataSource', 'magY1'); title('Response Y(§Ù)'); grid on; hold all;
subplot(3,2,3); plot(magX1, 'DisplayName', 'magX1', 'YDataSource', 'magX1'); title('Response X(§Ù)'); grid on;
subplot(3,2,5); plot(magH1, 'DisplayName', 'magH1', 'YDataSource', 'magH1'); title('Response H(§Ù)'); grid on;

% 	(b) Find & draw |X(k)|, |H(k)|, |Y(k)|
x = [x, zeros(1,4)];
h = [h, zeros(1,5)];
y = [y, zeros(1,2)];

magX2	=	abs(hw4(x, length(x), 2));
magH2	=	abs(hw4(h, length(h), 2));
magY2	=	abs(hw4(y, length(y), 2));

subplot(3,2,2); plot(magY2, 'DisplayName', 'magY2', 'YDataSource', 'magY2'); hold; grid on; axis([1 10 0 40]);
subplot(3,2,2); stem(magY2, 'DisplayName', 'magY2', 'YDataSource', 'magY2'); title('Response Y(x)');
subplot(3,2,4); plot(magX2, 'DisplayName', 'magX2', 'YDataSource', 'magX2'); hold; grid on; axis([1 10 0 6]);
subplot(3,2,4); stem(magX2, 'DisplayName', 'magX2', 'YDataSource', 'magX2'); title('Response X(x)');
subplot(3,2,6); plot(magH2, 'DisplayName', 'magH2', 'YDataSource', 'magH2'); hold; grid on; axis([1 10 0 6]);
subplot(3,2,6); stem(magH2, 'DisplayName', 'magH2', 'YDataSource', 'magH2'); title('Response H(x)'); hold off; figure(gcf)