Le 10/10/2018 à 08:47, Samuel Gougeon a écrit :
Le 09/10/2018 à 21:52, antoine monmayrant a écrit :
Hello Samuel,
Sorry I might not have made myself clear: fft and fftshift provide
the ability to perform transform along only one of the dimensions of
a multidimensional array.
Something like S(x,y,z) --[FFT along 3rd dim]-->
ffthift(ffft(S(x,y,z), -1,3),3)=Ŝ(x,y,kz).
In that case, you need to perform fft and eventually fftshift along
only the dimension of the transform.
ifftshift should also provide the same possibility to perform the
inverse transform: Ŝ(x,y,kz) --[IFFT along 3rd dim]-->
iffthift(ffft(Ŝ(x,y,kz), +1,3),3)=S(x,y,z).
This is a basic signal processing requirement in my field.
Hello Antoine,
Yes, you are right: in case of directional FFT and odd number of
elements along the chosen direction, ifftshift can't presently be used.
Could you please post the same remark on bugzilla? This bug/wish is
not yet reported.
Done: http://bugzilla.scilab.org/show_bug.cgi?id=15799
IMO we may propose and include it in Scilab as soon as for Scilab 6.0.2.
BTW, still IMO, fftshift and ifftshift should rather be merged in a
single function.
It's the same code, except a floor<=>ceil. This should deserve just an
option, not a separate dedicated function.
I guess that this separation likely comes from a kind of abusive
Matlab-like mimicry.
Best regards
Samuel
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