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

I got a myBodeplot.fig file with two subplots and want to extract the x and y values for magnitude and phase.

[Mathieu NOE]

File Exchange - MATLAB Central (mathworks.com)

Answer 1

[Paul]

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.

[Hansi K]

You saved my day, thx!! :)