Can not get vector field

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Marcin R
Marcin R 2021-12-12
评论： Marcin R 2021-12-13
Hello,
I try to plot vector field given by the formula:
in order to do so I defined:
y = 0:0.1:100;
x = -y;
and finaly try to plot it by quiver(x,y)
Unfortunately instead of vector filed around unit circle I get
Also, I feel like I don't get this from math perspective as well. The author says that this formula should give circular vector field which should be intuitively visibile - how, I don't see it right away.
Thanks for the clarification.

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KSSV
KSSV 2021-12-12
Ran in:
y = 0:0.1:100;
x = -y;
[X,Y] = meshgrid(x,y) ;
quiver(X,Y)
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KSSV
KSSV 2021-12-13
Ran in:
r = 1 ; % Radius of circle
C = [0 0 ] ; % Origin of circle
th = linspace(0,2*pi,100) ; %
x = C(1) + r*cos(th) ;
y = C(2) + r*sin(th) ;
plot(x,y,'b')
hold on
idx = 1:10:100 ;
quiver(x(idx),y(idx),-y(idx),x(idx))
Marcin R
Marcin R 2021-12-13
Thanks, this is exactly what I was looking for.

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