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songzq

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[求助] 如何绘制向量场(自己编了Matlab程序但结果好像不正确,求高人指点一下)

x = -400:10:800;
y = -400:10:800;
[x,y] = meshgrid(x,y);
R0=300;
u1=20;
fx=u1./(sqrt(x.^2+y.^2)*(x.^2+y.^2+R0.^2))*(-x.*(x.^2+y.^2-R0.^2)-y.*(2.*sqrt(x.^2+y.^2)*R0));
fy=u1./(sqrt(x.^2+y.^2)*(x.^2+y.^2+R0.^2))*(-y.*(x.^2+y.^2-R0.^2)+x.*(2.*sqrt(x.^2+y.^2)*R0));
cla;
quiver(x,y,fx,fy);
hold on

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