How to get modeshapes from fft

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Minas Emiris le 1 Avr 2020

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https://fr.mathworks.com/matlabcentral/answers/514596-how-to-get-modeshapes-from-fft

Hi all,

I have a vector of length 1502 rows x 1 column, Flux. I am combining all the flux values from a simulation on a matrix of dimensions 1502 rows x 20 columns, as 20 are the samples. How can I use 'fft' as a means of getting the modeshapes for each harmonic of each sample? Is there or package I could use for good visualisation?