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I can't draw the vector field

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윤형
윤형 2023-6-4
回答： the cyclist 2023-6-4
[x, y] = meshgrid(-0.9:0.3:0.9, -0.9:0.3:0.9);
R1 = (x.^2 + y.^2).^.5;
V = 1./R1;
figure(1)
surf(x, y, V)
view(-37.5, 20)
figure(2)
contour(x, y, V, 5)
hold on
axis square
[u, v] = gradient(V, 0.2);
quiver(x, y, -u, -v, 1.5)
axis equal
I can't draw the vector field. What's the problem

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回答（2 个）

Simon Chan
Simon Chan 2023-6-4
The spacing used in function gradient is 0.2, but the spacing in your data is 0.3 and hence it give you an error. Try using same spacing.
the cyclist
the cyclist 2023-6-4
Ran in:
The problem is the Inf values in u and v. Removing them:
[x, y] = meshgrid(-0.9:0.3:0.9, -0.9:0.3:0.9);
R1 = (x.^2 + y.^2).^.5;
V = 1./R1;
figure(1)
surf(x, y, V)
view(-37.5, 20)
figure
contour(x, y, V, 5)
hold on
axis square
[u, v] = gradient(V, 0.2);
u(isinf(u)) = NaN;
v(isinf(v)) = NaN;
quiver(x, y, -u, -v,1.5)
axis equal

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