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MATLAB December 24th
rho = pi*(1+sqrt(5))/2; n = 70000; x = 0:n; z = cumsum(exp(i*(rho*x.*x+.4))); [m,k] = max(imag(z)); plot(z,'g') axis image hold on plot(z(1:n/100:n),'ro','MarkerSize',4,'LineWidth',2) plot(z(k),'y*','MarkerSize',10,'LineWidth',2) axis off