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I can't draw the vector field

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윤형
윤형 el 4 de Jun. de 2023
Respondida: the cyclist el 4 de Jun. de 2023
[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

Respuestas (2)

Simon Chan
Simon Chan el 4 de Jun. de 2023
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 el 4 de Jun. de 2023
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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