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I can't draw the vector field

조회 수: 2 (최근 30일)
윤형
윤형 2023년 6월 4일
답변: the cyclist 2023년 6월 4일
[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

답변 (2개)

Simon Chan
Simon Chan 2023년 6월 4일
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 2023년 6월 4일
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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