How to use fft2 and find spatial wavenumbers (kx & ky) ?

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These are (5x5) arrayi.e 25 microphones arranged in 2-d space and each captures say 10000 samples/sec of data in time domain and this data is been stored in notepad as [10000(samples) x 25(mic's)] ,now i have data which is temporal and spatial hence I am stuck up with usage of FFT2.

1. I finally want to find fft2 of spatial data(x,y) and not temporal data
2. find kx and ky if possible
3. find the frequency of wave from mic data ?

[fs pramudya]

Hi there, have you find the answer of this question? i am new using matlab and encountering same problem. thanks!

Answer 1

[Daniel kiracofe]

First, you need to reshape your data so that it is 10000x5x5 instead of 10000x25 ("reshape" command could help here).

Then, assuming it is stored in a variable called "data", and that you want to find the spatial fft at sample "i" you could just do

result = fft2( squeeze( data(i,:,:) ) );