Animate the motion plot

Help me to solve this problem? i am trying using plot function but did'nt get required result.

1.1. Write MATLAB Script to animate the motion of the rolling disk for two
complete rotations, showing (as a trace) the trajectory of the point on the rim.
Take: radius of the disk equal to 10 units, radius of the point is also equal to 10
units. An example is presented below.

1.2 Produce a static plot for your system, showing the rim point's speed
using the "quiver" command. An example is presented below.

    enter code here r=10;y=10;
                    figure
                    t=0:pi/64/pi;
                     th = 0:pi/50:2*pi;
                       yline(0)
                    hold on
                   for x=-128:4:0
                       xp=r*cos(th)+x;
                       yp=r*sin(th)+y;
                        plot(xp,yp)
                   end

                   axis([-140 10 -40 60])
                   set(gca,'xtick',[-120:20:0])
                   set(gca,'ytick',[-50:10:70])
                   hold off`



i have  done till here but i am not getting how to plot points to show trace.
[Look at the image for better understanding of question]

[Abhishek Tyagi]

Please help me to solve this problem its really important

Answer 1

[Ahmed Redissi]

Here's an example that can help you create an animation:

% Create the trajectory
xtrajectory = linspace(-5,5);
ytrajectory = -(xtrajectory.^2)+25;

% Plot the trajectory
plot(xtrajectory,ytrajectory);
axis([-8 8 -2 28]);
grid;
hold on

% Create the disk
anglesdeg = 0:2.5:360;
angles = deg2rad(anglesdeg);
R = 1;
xdisk = R*cos(angles);
ydisk = R*sin(angles);

for i = 1:numel(ytrajectory)
    % Plot the disk
    x = xdisk+xtrajectory(i);
    y = ydisk+ytrajectory(i);
    p = plot(x,y,'b');
    
    % Pause to create the animation effect
    pause(0.1);
    
    % Delete the disk after it was plotted
    if i~=numel(ytrajectory)
        delete(p);
    end
end
hold off

Try to use this concept to create your animation.

[Abhishek Tyagi]

I think this concept is different.