Conversion of space-time data to wavenumeber-time data

I have a field data(space-time) that is dependent on space and time.I need to take fft or convert the space time data into wavenumber-time data. Can someone help me out.

Answer 1

[Bjorn Gustavsson]

Provided that your data is sampled on a regular spatial grid it should be as simple as to perform a (perhaps windowed) fft in the spatial dimension.

HTH

[Sidharth ramesh]

thank you for the support

i had doubt reagrding your answer my field data is just values alligned in a 200 x 513 matrix where each column is the value of field for specific position ranging from 0 to 512 and each row is the value of field for time 0 to 199.So like is it possible for such a matrix

[Bjorn Gustavsson]

Yes. Read the help and documentation for fft - that function by default calculates the fft of the first non-singleton dimension (that is typically the column) of an array. You can explicitly tell the function what dimension to do the transform on/in/for. From the help to fft:

    FFT(X,[],DIM) or FFT(X,N,DIM) applies the FFT operation across the
    dimension DIM.

This should clarify your question.

HTH

[Sidharth ramesh]

thank you so much