Fourier Transforms
These two buttons do pretty much what you expect. They perform a two dimensional fast fourier transform on the contents of the big array. These are normalized so that the forward and reverse transform give very similar results. For example if the big array contains something real (imaginary part zero) then the inverse transform is just the complex conjugate of the forward transform.
Fourier Transform
Inverse Fourier
Keyboard short cuts
The short cuts are -F
and
-I
for these opperations.