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on 19 Oct 2021
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N=200;
H=rand(N);
[y,x]=meshgrid(1:N);
for n=1:500
d=H-circshift(H,1);
g=100*(1+erf(d));
L=(1-erf(d));
m=mod(round(x+rand(1))-1,N)+1;
o=mod(round(y+L)-1,N)+1;
ig=accumarray([m(:),o(:)],g(:),[N,N]);
H=H-g+ig;
H=conv2(H,[0 0 0;0 0 1;1 1 1]/4,'same');
end
imagesc(diff(H(25:N,25:N)'))
colormap(fliplr(pink))
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