How can I plot an animated circle?

25 次查看（过去 30 天）
help_me
help_me 2017-12-8
回答： Jos (10584) 2017-12-8
I want to plot the radius of this circle going round (360 degrees) without the circle showing. So basically just a line fixed at the origin that spins for 2*pi.
I understand that I have to use a for loop between 0 to 2*pi but I don't get which variables I have to use.
Thanks

请先登录，再回答此问题。

回答（1 个）

Jos (10584)
Jos (10584) 2017-12-8
Calculate the endpoints
  • x = r*cos(2*pi*f*t)
  • y = r*sin(2*pi*f*t)
where r, is the radius, f is the frequency and t is the time.
figure
f = 0.3 ; % frequency
r = 2 ;
ph = plot(NaN,NaN,'b-o') ;
axis(1.1*[-r r -r r]) ;
axis square
tic
while(toc < 10)
t = toc ;
ph.XData = [0 r*cos(2*pi*f*t)] ;
ph.YData = [0 r*sin(2*pi*f*t)] ;
drawnow
end

类别

在 Help Center 和 File Exchange 中查找有关 Animation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by