MATLAB: Circle rotating and whirling

Question

Answer 1

Hello,

You can also refer this code,

close all
t = linspace(0,2*pi);
x = cos(t);
y = sin(t);
r1 = 3;
plot(r1*x,r1*y)                % plot circle of radius 3
r2 = 2;
r3 = 1;
x2 = r2*cos(-t);
y2 = r2*sin(-t);
axis equal
hold on
for i = 1:length(t)
    center = [x2(i),y2(i)];
    h = viscircles(center,r3,'color','r');
    pause(0.1)
    delete(h)
end
hold off

where "r1" is radius of circle 1, and r3 is radius of inner circle.