I need MATLAB code for fitting curve of FRF and I should repeat it for these 3 conditions?

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Research Gate Does it help researches to publicize their scientific work ?

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Dang N. H. Thanh

Try this https://www.mathworks.com/help/signal/ref/modalfrf.html

Giuseppe Pennisi

If you do not have the right toolbox for modalfrf, you can look into this: https://fr.mathworks.com/matlabcentral/fileexchange/58265-frf-estimation?focused=6578902&tab=function

Nooschin Hadidian. M

Many thanks for Dang Ngoc Hoang Thanh and Giuseppe Pennisi.