fft2: Frequency and wavenumber

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Woehrle 2012-6-6

评论： juntian chen 2021-12-16

Greetings all,

I'm trying to create a dispersion relation plot. (frequency vs. wavenumber) I have two columns col1=field data and col2 = time

My question is...If I took the fft2(X) would this produce a fft in space and in time?

Here is what I have been attempting to use:

dt = (7.62629947812*10^-12)*10; %dump interval set to 10 time steps
t = (0:dt:dt*300047)';
Bz = data(:,9);
w =horzcat(Bz,t);
plot(abs(w))

Thanks for your time

Dr. Seis 2012-6-7

Take a look at my post here for an idea of what is output from FFT2:

Woehrle 2012-6-7

Awesome! Thanks for the tip.

juntian chen 2021-12-16

it goes wrong when time series is long

MATLAB Mathematics Fourier Analysis and Filtering

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