MATLAB: Fft dim parameter when ndims(x) > 2

Question

fft dim shows how dim parameter is used for multidimensional signals of ndims(X) = 2

When ndims(X) > 2 how is it used?

(I cannot use fftn here.)

Answer 1

If you have a multidimensional array x, say

x = ones(3,4,5)

then

fft(x,[],3)

will perform FFT on the dimension with 5 elements, and so on.

HTH