Extract data points from bodemag plot

Looking for a way to extract the data points of the magnitude from a bodemag plot. How can this be done?

Answer 1

[Star Strider]

it would likely be easier to use the approach bode in Obtain Magnitude and Phase Data. (Remember to use the squeeze function with those, if necessary.)

This seems to work —

H = tf([1 0.1 7.5],[1 0.12 9 0 0]);
bodemag(H)

Ax = gca;
% get(Ax)
Lines = findobj(Ax, 'Type','Line');
% L1 = Lines(1);
L2 = Lines(2);
X = L2.XData

X = 1×88

0.0000 0.0000 0.0000 0.0000 0.0001 0.0055 0.0548 0.0640 0.0747 0.0873 0.1019 0.1190 0.1390 0.1623 0.1896 0.2214 0.2586 0.3020 0.3527 0.4119 0.4811 0.5618 0.6561 0.7663 0.8950 1.0452 1.2207 1.4257 1.5382 1.7142

Y = L2.YData

Y = 1×88

798.4164 648.8739 448.8739 288.8739 168.8739 88.8739 48.8734 46.1771 43.4807 40.7842 38.0875 35.3907 32.6936 29.9961 27.2982 24.5995 21.8999 19.1990 16.4963 13.7912 11.0825 8.3690 5.6486 2.9181 0.1728 -2.5953 -5.3997 -8.2660 -9.7058 -11.8313

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