Is fftn() and ifftn() equivalent to a 3D Fourier Transform in this case?

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J W
J W on 21 Jan 2016
Commented: J W on 21 Jan 2016
I'm trying to solve the 3D Heat Equation with Fourier Transforms. I'll have a 3D matrix with solutions u(x,y,z,t_n) at each node (created with meshgrid()). I then wish to find the 3D fft of that solution matrix to get the associated Fourier coefficients (which will be functions of time). Then I wish to forward those coefficients in time, and take the 3D ifft to recover the solution u(x,y,z,t_n+1) at the next time step. Is fftn() and ifftn() equivalent to 3D Fourier Transforms in this case?

Accepted Answer

David Young
David Young on 21 Jan 2016
fftn(X) and ifftn(X) carry out a 3-D FFT or a 3-D inverse FFT if length(size(X)) is equal to 3.
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