How can I extract the x and y values of the phase- and magnitude graph of a .fig file plotted with bodeplot() or bode()?

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Hansi K
Hansi K 2023-12-12
评论： Hansi K 2023-12-18
I got a myBodeplot.fig file with two subplots and want to extract the x and y values for magnitude and phase.

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Paul
Paul 2023-12-16
编辑：Paul 2023-12-16
Ran in:
sys = tf(1,[1 1]);
bode(sys);
hf = gcf;
hax = hf.Children
hax =
3×1 graphics array: ContextMenu Axes Axes
hax(2).Children % the first child is the phase plot
ans =
2×1 graphics array: Group (sys) Line
hax(2).Children(1)
ans =
Group (sys) with properties: Children: [1×1 Line] Visible: on HitTest: on Use GET to show all properties
hax(2).Children(1).Children
ans =
Line with properties: Color: [0 0.4471 0.7412] LineStyle: '-' LineWidth: 0.5000 Marker: 'none' MarkerSize: 6 MarkerFaceColor: 'none' XData: [1.0000e-20 2.0000e-17 2.0000e-12 2.0000e-08 2.0000e-05 0.0020 0.0200 0.0234 0.0273 0.0320 0.0374 0.0437 0.0511 0.0598 0.0699 0.0818 0.0956 0.1118 0.1308 … ] (1×63 double) YData: [0 0 -1.1459e-10 -1.1459e-06 -0.0011 -0.1146 -1.1458 -1.3398 -1.5666 -1.8318 -2.1418 -2.5042 -2.9277 -3.4225 -4.0005 -4.6754 -5.4629 -6.3811 -7.4508 -8.6949 … ] (1×63 double) ZData: [1×0 double] Use GET to show all properties
w = hax(2).Children(1).Children.XData;
phase = hax(2).Children(1).Children.YData;
figure
semilogx(w,phase),grid
Note that bode keeps reasonable limits on the frequency axis
figure
semilogx(w,phase),grid
xlim([0.01 100])
Repeat for magnitude plot.

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