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[x,y,z]=meshgrid(0:1/100:2,0:1/100:2,0:1/100:2);
A=xlsread('C:\Users\aaa\Desktop\GC×ø±ê£¬µçºÉ.xls');
x0=A(:, 1);
y0=A(:, 2);
z0=A(:, 3);
q0=A(:, 5);
Vx=0;Vy=0;Vz=0;Fx=0;Fy=0;Fz=0;
for i=1:size(x0,1);
    Vx=Vx+q0(i).*(x-x0(i))./((x-x0(i)).^2+(y-y0(i)).^2+(z-z0(i)).^2);
    Vy=Vy+q0(i).*(y-y0(i))./((x-x0(i)).^2+(y-y0(i)).^2+(z-z0(i)).^2);
    Vz=Vz+q0(i).*(z-z0(i))./((x-x0(i)).^2+(y-y0(i)).^2+(z-z0(i)).^2);
    Fx=Fx+q0(i).*(x-x0(i))./((x-x0(i)).^3+(y-y0(i)).^3+(z-z0(i)).^3);
    Fy=Fy+q0(i).*(y-y0(i))./((x-x0(i)).^2+(y-y0(i)).^2+(z-z0(i)).^2);
    Fz=Fz+q0(i).*(z-z0(i))./((x-x0(i)).^2+(y-y0(i)).^2+(z-z0(i)).^2);
    V=Vx+Vy+Vz;F=Fx+Fy+Fz;
end
subplot(1,2,1)
slice(x,y,z,V,2,2,2);
subplot(1,2,2)
slice(x,y,z,F,2,2,2);
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