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star traces 1219

Alex P. on 17 Oct 2021
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figure('Color','k')
x=.1;y=.2;t=1;
for i=2:1e4
a=x(i-1);
b=y(i-1);
x(i)=-.61-.42*a-.41*a^2+-.8*a*b+.7*b+.3*b^2;
y(i)=-.72+(.4)*a+(.5)*a^2 + (.5)*a*b+.4*b-.2*b^2;
t(i)=t(i-1)+1;
end
%colors!!
scatter(x, y, 1000./t, t,'Marker','h','MarkerFaceColor',[1 1 0]);
colormap(flipud(autumn));
axis([-2,1,-.7,.7],'off');
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