?? ex031300.m
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w = [0:1:500]*pi/500; % [0, pi] axis divided into 501 points.
X = exp(j*w) ./ (exp(j*w) - 0.9*ones(1,501));
magX = abs(X); angX = angle(X);
subplot(2,1,1); plot(w/pi,magX); grid; axis([0,1,0,10])
xlabel('frequency in pi units'); ylabel('|H|');
title('Magnitude Response');
subplot(2,1,2); plot(w/pi,angX/pi); grid
xlabel('frequency in pi units'); ylabel('Phase in pi Radians');
title('Phase Response');
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