Displaying 1 result from an estimated 1 matches for "fftshift".
Did you mean:
bitshift
2012 Dec 07
0
fft and wavenumber
...n image A with dimension (Nx,Ny) and are not sure on how to compute the wavenumber.
I have done like that but i am not sure i am computing the wavenumber in the correct way..can someone help?
sara
image.plot(x,y,A)
dx = diff(x)[1]
dy = diff(y)[1]
## This is equivalent to what the matlab fftshift function does
fzs = fft(A)
Fzs = fftshift2D(fzs)/(Nx*Ny);
## compute the wave number for the shifted fourier transform
k = seq(-pi/dx,pi/dx,length.out=Nx);
l = seq(-pi/dy,pi/dy,length.out=Ny);
[[alternative HTML version deleted]]