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on 20 Oct 2021
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c='color';S=@subplot;C=@cos;
figure(c,'k')
S(131)
text(0,.5,'i','FontSize',40,c,'g')
axis off
S(132)
t=linspace(0,2*pi);
x=16*sin(t).^3;
y=13*C(t)-5*C(2*t)-2*C(3*t)-C(4*t) ;
patch(x,y,'r')
axis equal off
S(133)
surf(160*membrane(1,100),EdgeA=0);
colormap(jet)
view(3)
axis equal off
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