Using a quiver function draw a plot

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Hyo Yun 2022-11-21

评论： Voss 2022-11-21

I am trying to use a quiver function to draw a plot from -1 <= x,y <= 1

So far, for my code, I have...

syms x y z

u = @(x,y) y / (x.^2 + y.^2);

v = @(x,y) -x / (x.^2 + y.^2);

[x,y] = meshgrid(-1:1, -1:1);

quiver(x,y,u,v,0)

But I am getting an error saying, "Error using quiver, Input arguments must be numeric or objects which can be converted to double"

u and v are the i and j component of a vector I need to plot from -1 to 1. How do I plot this graph?

Please help and thank you

Voss 2022-11-21

u = @(x,y) y ./ (x.^2 + y.^2); % use ./ instead of /

v = @(x,y) -x ./ (x.^2 + y.^2);

[x,y] = meshgrid(-1:1, -1:1);

quiver(x, y, u(x,y), v(x,y), 0) % evaluate u and v at (x,y)

Hyo Yun 2022-11-21

Thank you very much!

Voss 2022-11-21

You're welcome!

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