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[X,Y] = meshgrid(-10:10);
Z=ÄãµÄ¹«Ê½
[Dx,Dy]=gradient(Z,1,1);
quiver(X,Y,Dx,Dy);

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2Â¥: Originally posted by wake_up at 2016-03-15 23:22:13
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= meshgrid(-10:10);
Z=ÄãµÄ¹«Ê½
=gradient(Z,1,1);
quiver(X,Y,Dx,Dy);

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d=4;
x0=0;
y0=0;
v = -10:1:10;
[x,y] = meshgrid(v);
r=((x-x0)^2+(y-y0)^2)^(1/2);
V=4*pi*r.^3./3;
m=4./pi./(r.^2+d^2).^(3./2);
detaV=0.1*V;
Ux=3*detaV*(x-x0)./m;
Uy=3*detaV*(y-y0)./m;
Uz=3*detaV*d./m;
quiver(x,y,Ux,Uy)

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6Â¥: Originally posted by wake_up at 2016-03-16 16:41:14
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9Â¥: Originally posted by wake_up at 2016-03-16 19:02:26
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