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on 22 Oct 2021
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% Wang Sun
t =0:5e-4:30; %
% dyn
[~,o]=ode15s(@f,t,[.1 0 0]);
patch(o(:,1),o(:,2),o(:,3),t,EdgeC='b');
set(gcf,Color='k')
colormap(autumn);
line([1.1 .4],[-.5 .3],'Color','g',LineW=8)
axis off
% equation
function q=f(t,X)
x=X(1);
y=X(2);
z=X(3);
a=.2; b=-.01; c=1; d=-.4; e=-1;E=-1;
q=[x*a+c*y*z;
b*x+d*y-x*z;
e*z+E*x*y];
end
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