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

11 Ansichten (letzte 30 Tage)
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?

Akzeptierte Antwort

David Young
David Young am 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.
  2 Kommentare
J W
J W am 21 Jan. 2016
Perfect. My length(size(X)) = 3. I may post this as a separate question if it's inappropriate to ask here, but should I be worrying about using fftshift()? I've heard that fftn() returns values in a weird order.
J W
J W am 21 Jan. 2016
Regardless, I'll be accepting your answer. Thanks very much

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (0)

Kategorien

Mehr zu Fourier Analysis and Filtering finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by