% Part (d)

b2 = [ 4 ];
a2 = [ 1 1 16.25 ];
poles2 = roots(a2);

pzplot(b2,a2,-0.25);
title('H_2(s)');
print H2_poles.eps -deps

omega = linspace(-10,10,1000);
h2 = freqs(b2,a2,omega);
plot(omega,abs(h2));
title('|H_2(j\omega)|');
xlabel('\omega');
print H2_freq.eps -deps

% Since the poles of H2 are nearer to the imaginary axis,
% the peaks are sharper and higher.
