Try this code:
N1 = 200; % Number Of Points In Ring
R1 = 0.25 + 0.2*(rand(1, N1)-0.5); % Random Marker Radii
A1 = linspace(0, 2*pi, N1); % Define Angle Vector
Ring1 = R1.*[cos(A1); sin(A1)]; % Create Ring Coordinates
N2 = 200;
R2 = 0.85 + 0.2*(rand(1, N1)-0.5);
A2 = linspace(0, 2*pi, N1);
Ring2 = R2.*[cos(A1); sin(A1)];
figure
plot(Ring1(1,:), Ring1(2,:), ‘^b’, ‘MarkerFaceColor’,’b’)
hold on
plot(Ring2(1,:), Ring2(2,:), ‘or’, ‘MarkerFaceColor’,’r’)
hold off
axis equal
N1 = 200; % Number Of Points In Ring
R1 = 0.25 + 0.2*(rand(1, N1)-0.5); % Random Marker Radii
Z1 = 0.10 + 0.2*(rand(1, N1)-0.5); % Random Z-Values
A1 = linspace(0, 2*pi, N1); % Define Angle Vector
Ring1 = R1.*[cos(A1); sin(A1)]; % Create Ring Coordinates
N2 = 200;
R2 = 0.85 + 0.2*(rand(1, N1)-0.5);
Z2 = 0.80 + 0.2*(rand(1, N1)-0.5);
A2 = linspace(0, 2*pi, N1);
Ring2 = R2.*[cos(A1); sin(A1)];
figure
plot3(Ring1(1,:), Ring1(2,:), Z1, ‘^b’, ‘MarkerFaceColor’,’b’)
hold on
plot3(Ring2(1,:), Ring2(2,:), Z2, ‘or’, ‘MarkerFaceColor’,’r’)
hold off
axis equal
grid on
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