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I have input force data and output acceleration data to calculate frequency response functions. As these data are in time domain I converted it to frequency domain using fft function in MATLAB. This is the procedure I used.

As an example Let's think, Force matrix =a

Acceleration matrix= b

c=fft2(a)./fft(b);

d=real(c);

There are 24 sensors in the system and I used all data once by using a matrix. I am not sure whether this is correct or not. Should I use one data at once or matrix is correct. Can anyone help me? It is a great help for me.

Thank you!!!