Extract data from matlab default plots

I have this code that plots the response of a structure to an excitation signal. MATLAB has two functions that do the work, as you may see in my code that I am using those function (modalfrf and modalfit). I want to extract the data in those plots and re-plot them against other variables. My question is "How can I extract the x-axis and y-axis data from those default plots?"

I have attached my code along with two .mat files that are needed to run the code.

Fs = 4000
modalfrf(ex_signal(1:1024) ,ACC,Fs,1000);
[frf,fff] = modalfrf(ex_signal(1:1024),ACC,Fs,1000);
modalfit(frf,fff,Fs,15,'FitMethod','lsrf');

[Image Analyst]

Why do you need to extract them from the plot when you still have the original data?

If you did, I believe you can ask the axes for the xdata and ydata properties.

[Ahmed Alsaadi]

MATLAB functions process the data, the output of (modalfrf and modalfit) is different from the input. I need to extract the output of those functions. I tried findobj but it didn't work.

[Image Analyst]

Did you try

ax = gca;
xdata = ax.XData;

or something like that?

[Ahmed Alsaadi]

Yes, I tried it but I got an error that says

"No appropriate method, property, or field 'XData' for class 'matlab.graphics.axis.Axes'."

Answer 1

[Star Strider]

Call it with as many outputs as you need, then use the outputs in your subsequent calculations:

[frf,f,coh] = modalfrf(___)

You can also plot the outputs, or call modalfit separately without outputs to do the plot you want.