Best way to resample the output of a Simulink simulation with variable time step into a signal with a fixed sample time

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Bill Tubbs
Bill Tubbs 2020-10-29
评论： Ameer Hamza 2020-10-30
I have a simulation model that runs with a variable timestep:
(I don't want to change this)
For the purpose of system identification it would be convenient to have the output signals sampled at a regular frequency.
This seems to work:
y_resampled = resample(simOut.POW,simOut.POW.Time)
According to the documentation, this resamples the values, simOut.POW, by linear interpolation onto a vector of uniformly spaced instants with the same endpoints and number of samples as simOut.POW.Time.
Not sure if it is the right way to do it or if there is a better function to use.

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Ameer Hamza
Ameer Hamza 2020-10-29
No, resample() samples the signal at vector specified by simOut.POW.Time. So, in this case, it is not doing anything. I suggest using interp1()
t_equally_spaces = min(simOut.POW.Time):0.01:max(simOut.POW.Time);
y_resamples = interp1(simOut.POW.Time, simOut.POW.Data, t_equally_spaces)
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