How can i plot zero and its frequency responsE

Question

PAUL 2014-3-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/122539-how-can-i-plot-zero-and-its-frequency-response

编辑： Azzi Abdelmalek 2014-3-23

How can i plot zero and its frequency response

b = conv([1 -1.08 0.3132],[1 -1.315 0.6182])
c =b;
a = [0 0 0 0.0686]
[z,p,K] = tf2zp(c,a);
figure(1)
zplane(a,c)
xlabel('Re(z)');
ylabel('Im(z)');
title('POLE DIAGRAM OF THE TRANSFER FUNCTION H(z)')
w = -pi:(pi/500):pi;
H = freqz(a,c,w);
figure(2)
subplot(2,1,1); 
plot(w, abs(H),'r','LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('Magntiude');
title('MAGNITUDE FREQUENCY RESPONSE OF THE TRANSFER FUNCTION H(z)')
subplot(2,1,2);
plot(w, angle(H),'r', 'LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('phase');

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Azzi Abdelmalek 2014-3-23

Paul, why are you changing your question?

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Answer 1

Azzi Abdelmalek 2014-3-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/122539-how-can-i-plot-zero-and-its-frequency-response#answer_129531

编辑：Azzi Abdelmalek 2014-3-21

在 MATLAB Online 中打开

The numerator should be

a = 0.0686

To find poles and zeros

[z,p,K] = tf2zp(a,c); % not tf2zp(c,a)

Add

b = conv([1 -1.08 0.3132],[1 -1.315 0.6182])
c =b;
a = 0.0686
[z,p,K] = tf2zp(a,c);
figure(1)
zplane(a,c)
xlabel('Re(z)');
ylabel('Im(z)');
title('POLE DIAGRAM OF THE TRANSFER FUNCTION H(z)')
w = -pi:(pi/500):pi;
H = freqz(a,c,w);
figure(2)
subplot(2,1,1); 
plot(w, abs(H),'r','LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('Magntiude');
title('MAGNITUDE FREQUENCY RESPONSE OF THE TRANSFER FUNCTION H(z)')
subplot(2,1,2);
plot(w, angle(H),'r', 'LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('phase');