Animate the motion plot

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Abhishek Tyagi
Abhishek Tyagi 2021-4-15
编辑： Abhishek Tyagi 2021-4-16
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]
  1 个评论
Abhishek Tyagi
Abhishek Tyagi 2021-4-16
Please help me to solve this problem its really important

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回答（1 个）

Ahmed Redissi
Ahmed Redissi 2021-4-15
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.

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