How to create 3D Fourier matrix?

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Matteo Cencini
Matteo Cencini il 6 Apr 2016
Commentato: Muhammad Amir il 8 Nov 2016
I would like to create a Fourier matrix for a 3D fourier transform. I know that for 1D FFT in Matlab it can be created with dftmtx and I can extend to 2D FFT using kron like this:
FT1D=dftmtx(N); FT2D=kron(FT1D,FT1D); Is there any way to extend it to 3 dimensions? Thank you for your help.

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