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on 25 Oct 2021
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for n=1:8
x = ones(1e5,2);
x(1,1) = 6*rand*cos(2*pi/8*n);
x(1,2) = 6*rand*sin(2*pi/8*n);
dt = 0.01;
m = 0.5;
for i=1:1e5-1
x(i+1,:) = x(i,:) + dt*[x(i,2) m*(1-x(i,1)^2)*x(i,2)-x(i,1)];
end
plot(x(:,1),x(:,2),'linewidth',2); hold on;
end
axis equal off;
set(gcf,'color','k');
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