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beautiful grid
on 11 Oct 2021
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N=500
for k=1:1:N
t=0:(0.99*pi/2):k;
x=t.*cos(t);
y=2*t.*sin(t);
plot(y,x,'r')
hold on
plot(x,y,'k');
axis ([-N N -N N]);
%set(h,'xdata',x,'ydata',y);
%M(k)=getframe;
end