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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Rick Rosson
2014년 10월 19일
편집: Rick Rosson
2014년 10월 19일
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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