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Logrithmic spiral
on 8 Oct 2021
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n = 25;
th = n*pi;
Th = linspace(0,th,1250);
x = exp( -.5.*Th/(2*pi)).*cos(Th);
y = exp(- .5.*Th/(2*pi)).*sin(Th);
stem3(x,y,Th,'Markersize',2) ;axis off