Problem in plotting using semilogx() function

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PVR
PVR 2014-10-19
编辑： Rick Rosson 2014-10-19
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.
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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采纳的回答

Rick Rosson
Rick Rosson 2014-10-19
编辑：Rick Rosson 2014-10-19
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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