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on 22 Oct 2022
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n = 2^10;
M = zeros(n);
I = 1:n;
x = I-n/2.5;
y = n/2.5-I;
[X,Y] = meshgrid(x,y);
R = 10;
A = (X.^2 + Y.^2 <= R^2);
M(A) = 1;
DP = fftshift(fft2(M));
imagesc(abs(log10(DP)))
colormap jet
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