I have two sets of one second voltage data sampled with 4000Hz and I can plot all the voltage points vs time points in MATLAB. So it means I have a data matrix with with length of 4000 one column for the time in seconds the other for the voltage.
Now I have simultaneously sampled two data matrix in time domain with this way. One is input to a filter (Vin,t) the other is output (Vout,t). I want to find the transfer function both for amplitude and phase shift.
How can I take the Laplace transform of this data? Can I do it without converting it to a expressible function like poly-fit?