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on 25 Oct 2021
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n=200;
[x,y]=meshgrid(1:n);
a=ones(n);
b=rand(n)>.99;
m=1./[20 5 20;5 -1 5;20 5 20];
f=.04;
k=.06;
for i=1:400
A=a+(conv2(a,m,'same')-a.*b.*b+f.*(1-a));
B=b+(conv2(b,m,'same')/2+a.*b.*b-(k+f).*b);
a=A;b=B;
end
surf(a)
zlim([0 4])
shading flat
axis off
view([-65 75])
colormap(spring)
light
set(gcf,Color="k")
% camzoom(2)
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