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on 7 Oct 2022
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m=4;
n=2^9;
G=@(x,y)meshgrid(x:y,x:y);
d=4*pi*interp2(rand(n)-.5);
I=d(1:n,1:n);
[x,y]=G(-m,m);
a=2*m^2;
F=exp(-x.^2/a-y.^2/a);
F=F./sum(F(:));
I=conv2(I,F,'same');
x=G(1,n);
Z=sqrt((x-n/2).^2+(x.'-n/2).^2) - n/2.5;
imshow(tanh(I).*min(max(sign(Z),-1),0));
colormap turbo;
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