# Performing the transform on the below logic

3 vues (au cours des 30 derniers jours)
Amy Topaz le 14 Mar 2022
Commenté : Amy Topaz le 28 Mar 2022
I have the below function for which I need to perform spatial Fourier transform and plot its spatial frequency spectrum for various values of y.
How to do this using matlab?
Y1 = acos(x/2+y) + asin(g/3+x);
%g is constant
##### 1 commentaireAfficher -1 commentaires plus anciensMasquer -1 commentaires plus anciens
AndresVar le 14 Mar 2022
Modifié(e) : AndresVar le 14 Mar 2022
for various values of y & x?
you can create a meshgrid of y's and x's
evaluate the function f(x,y)

Connectez-vous pour commenter.

### Réponse acceptée

AndresVar le 14 Mar 2022
Make a grid, evaluate the function and use fft2 to get the spatial spectrum.
Here is an example, note function might be different fom what you posted.
Note fftshift was used to shift the spectrum to the center, you can try without.
g=10; % for example
x=linspace(1,4,10); % for example
y=linspace(1,4,10); % for example
[X,Y]=meshgrid(x,y); % a grid
F = (atan(g/2+X)./Y+atan(g/2-X)./Y)/pi; % evaluate the grid
F_PS = abs(fftshift(fft2(F))); % power spectrum, shifted
imagesc(F_PS);
##### 1 commentaireAfficher -1 commentaires plus anciensMasquer -1 commentaires plus anciens
Amy Topaz le 28 Mar 2022
Thank you

Connectez-vous pour commenter.

### Catégories

En savoir plus sur Spectral Measurements dans Help Center et File Exchange

### Community Treasure Hunt

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

Start Hunting!

Translated by