3D streamline plotting not working

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Dario Cortese 2021-1-15

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/718065-3d-streamline-plotting-not-working

I am trying to test streamline with a very simple 3D vector field. I fill in a mesh using 3 for loops (not the best, but this is reminescent of a different expression for "v" which I couldn't easily vectorise). Then I define the vector field v as r. Simple radial field. My full code is below. quiver3 is fine, but unfortunately streamline gives me the following error:

Error using griddedInterpolant
Interpolation requires at least two sample points in each dimension.

N = 5;
L = 2;
dl = 2*L/N;
for i = 1:N+1
    for j = 1:N+1
        for k = 1:N+1
         
            x = -L + (i-1)*dl;
            y = -L + (j-1)*dl;
            z = -L + (k-1)*dl;
            
            X(i,j,k) = x;
            Y(i,j,k) = y;
            Z(i,j,k) = z;
            
            r = [x,y,z];
            
            v = r-r0;
            
            Vx(i,j,k) = v(1);
            Vy(i,j,k) = v(2);
            Vz(i,j,k) = v(3);
            
        end
    end
end
quiver3(X,Y,Z,Vx,Vy,Vz);
[sx,sy,sz] = meshgrid(1,0:1:5,0:1:5);
streamline(X,Y,Z,Vx,Vy,Vz,sx,sy,sz);
hold on;
streamslice(X,Y,Z,Vx,Vy,Vz,[],[],5);
pbaspect([1,1,1])