How to move a marker along line in polar coordinate

I want to draw a point that can move along to the Lemniscate of Bernoulli in polar coordinate. The example to move object along to a line is shown in this URL:https://www.mathworks.com/help/matlab/creating_plots/move-group-of-objects-along-line.html

The following code is the my try to realize my target. But it just can animate a line in coordinate system:

clear;
theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range
r = -sqrt(cos(2*theta));

figure;
polarplot(theta, r, 'b', 'LineWidth',1.0);
hold on
h = animatedline;
rlim([0 1]);
h.LineWidth = 1.5;
h.LineStyle = ":";
h.Color=[1 0 0] ;
n= length(theta);
for k = 1:length(theta)
    addpoints(h,theta(k),r(k))
    drawnow
end

Answer 1

[Sulaymon Eshkabilov]

Here it is:

clear;
theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range
r = -sqrt(cos(2*theta));
figure;
polarplot(theta, r, 'b', 'LineWidth',1.0);
hold on
H = animatedline('Marker', 'o', 'MaximumNumPoints',1);
for k = 1:length(theta)
    addpoints(H,theta(k),r(k));
    drawnow
end

[ロン]

Thank you very much. It works! You help me a lot

[Sulaymon Eshkabilov]

Most welcome. Glad to help.

Answer 2

[Sulaymon Eshkabilov]

Here is the corrected plot that animates a marker.

clear;
theta = -pi/4:0.001:0; % cosine of 2*theta will be positive for this range
r = -sqrt(cos(2*theta));
figure;
polarplot(theta, r, 'b', 'LineWidth',1.0);
hold on
H = animatedline('Marker', 'o');
rlim([0 1]);
n= length(theta);
for k = 1:n
    addpoints(H,theta(k),r(k))
    drawnow
end

[ロン]

Thanks for your help. But what I mean is that one point moving along to the line like this: https://img2020.cnblogs.com/blog/1616994/202004/1616994-20200427202415851-43829874.gif