MATLAB: Change marker width in bode plot

Question

By default, the marker width of the bode plot is very large. There is an option to change the line width but no option to change the marker width? How can I change it ?

Answer 1

The bode function doesn’t accept many options with respect to its plots. The easiest way to do what you want is to request at least the first three outputs of the bode function, and then plot them using subplot and plot. The plots are the same as any other plot object:

[mag,phase,wout] = bode(sys);
subplot(2,1,1)
plot(wout, mag)
subplot*2,1,2)
plot(wout, phase)

Use ‘20*log10(mag)’ to plot the magnitude in decibels, and semilogx instead of plot to make the plot look like those bode produces on its own:

[mag,phase,wout] = bode(sys);
subplot(2,1,1)
semilogx(wout, 20*log10(mag))
subplot*2,1,2)
semilogx(wout, phase)