Plot a circle and a vector moving around it

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Nathan Kennedy
Nathan Kennedy 2018-1-9
回答： Star Strider 2018-1-9
Hi
Draw a circle, then plot multiple vectors from the origin to the outline of the circle
angle = 0:0.05:2*pi
x = cos(angle)';
y = sin(angle)';
z = [x,y];
figure(1)
hold on
plot(x,y) % circle
for i = 1:length(angle)
plotv(z,'-') %plot vector for each angle
drawnow;pause(0.2);
end
but it is only drawing the same one one at 45 degrees

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回答（2 个）

KSSV
KSSV 2018-1-9
r = 1. ; % radius of circle
th = linspace(0,2*pi) ;
x = r*cos(th) ;
y = r*sin(th) ;
plot(x,y)
quiver(x,y,x,y)
  2 个评论
Nathan Kennedy
Nathan Kennedy 2018-1-9
I don't think quiver is suitable as it plots all of them at the same time and drawnow cant be used?

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Star Strider
Star Strider 2018-1-9
Try this slight variation on your code:
figure(1)
AxH = axes('NextPlot', 'add');
plot(x,y) % circle
for i = 1:length(angle)
plot([0 z(i,1)], [0 z(i,2)],'-') %plot vector for each angle
axis([-1.1 1.1 -1.1 1.1])
axis equal
drawnow
pause(0.1);
end

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