Legend does not recognize semilogx plot
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Felix Tieleman
il 4 Apr 2022
Risposto: Star Strider
il 4 Apr 2022
The legend I plot does not recognize all my plots. I have 1 bode plot (only the magnitude) and 2 semilogx plots. The first two semilogx plots do not seem to appear in the legend. Logically, Matlab also tells me that it is ignoring 'extra' legend entries.
This is my relevant code
figure(5),clf(5)
p = bodeoptions('cstprefs');
p.FreqUnits = 'rad/s';
p.PhaseVisible = 'off';
hold on
semilogx(w,spec_y(1:length(f)),'r')
semilogx(w,spec_y0(1:length(f)),'b')
bodeplot(G0,p,'g');
legend('y','y0','Exact')
grid on
%set(gca, 'XScale', 'log');
xlabel('w (rad/s)')
ylabel('|Mag| (dB)')
This is the output, showing only the first legend entry for the 'bodeplot(G0,p,'g')' plot.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/952589/image.png)
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Star Strider
il 4 Apr 2022
I have no idea what the other values are that you are plotting on the bodeplot axes. Apparently, the only legend entries bodeplot permits are the systems it plots.
It might be easier to get the data from bodeplot and plot everything on ‘ordinary’ axes.
This outlines how to get those data from bodeplot —
sys = tf([1 0 0],[1 1 1 1 1])
h = bodeplot(sys)
Frq = h.Responses.Data.Frequency
Mag = h.Responses.Data.Magnitude
Phs = h.Responses.Data.Phase
.
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