Problem in plotting using semilogx() function
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I need to plot a graph between w(frequency) and Mdb(Magnitude in db) using semilogx() function for different values of w. The output of graph is null. It shows nothing and there are no errors displayed. Where did I go wrong.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145763/image.jpeg)
R=zeros(1,10000);
I=zeros(1,10000);
Mag=zeros(1,10000);
Z=zeros(1,10000);
Y=zeros(1,10000);
Mdb=zeros(1,10000);
for *w* = 0.1:0.01:10
R=(256-(16*w^2))/((16-(w^2))^2+(10*w)^2);
I=-160*w/((16-w^2)^2+(10*w)^2);
Mag=sqrt(R^2+I^2);
Z=atan2(I,R);
Y=Z*180/pi;
*Mdb* =20*log10(Mag); *bold*
plot(w,Mdb,'g');
semilogx(w,Mdb);
end
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Risposta accettata
Rick Rosson
il 19 Ott 2014
Modificato: Rick Rosson
il 19 Ott 2014
Vectorized code, no for-loop necessary:
w = 0.1:0.01:10;
R = (256-(16*w.^2))./((16-(w.^2)).^2+(10*w).^2);
I = -160*w./((16-w.^2).^2+(10*w).^2);
X = complex(R,I);
Mag = abs(X);
Mdb = 20*log10(Mag);
phi = angle(X)*180/pi;
figure;
ax(1) = subplot(2,1,1);
semilogx(w,Mdb);
grid on;
xlabel('Frequency');
ylabel('Magnitude in dB');
ax(2) = subplot(2,1,2);
semilogx(w,phi);
grid on;
xlabel('Frequency');
ylabel('Phase angle in degrees');
linkaxes(ax,'x');
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