quiver3 plot on a flat space (2D)

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Hugo
Hugo 2011-9-19
回答： Notsure USA 2013-11-1
Hi, I need to plot a 3 components vector field V=(u(x,y),v(x,y),w(x,y)) (using quiver3 function) which, as you can see, doesn't depend on the z coordinate so I need to plot the latter on the plane z=0. How can I code this -- Thanks a lot by advance.

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回答（2 个）

the cyclist
the cyclist 2011-9-19
So you want every arrow to originate at the z=0 plane, but the vector can point in any direction? If so, here is an example, adapted from "help quiver3":
[x,y] = meshgrid(0:.5:2,-1:.2:1);
z = x .* exp(-x.^2 - y.^2);
[u,v,w] = surfnorm(x,y,z);
z = zeros(size(x));
quiver3(x,y,z,u,v,w);
Notsure USA
Notsure USA 2013-11-1
Just use quiver3() and then view(0,90) to look on from the top (projected into x,y-plane).

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