fft2: Frequency and wavenumber

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

Answer 1

[Dr. Seis]

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

http://www.mathworks.com/matlabcentral/answers/24965-fft2-function-in-matlab

[Woehrle]

Awesome! Thanks for the tip.

[juntian chen]

it goes wrong when time series is long