038 Matlab surf plot

surf plot

x=linspace(-0.2,0.2,100);
y=linspace(-0.2,0.2,100);
[X,Y]=meshgrid(x,y);

e=8.8541878*10^-12;
q1=2*10^-10;
q2=3*10^-10;

r1=sqrt((X+0.25).^2+Y.^2);
r2=sqrt((X-0.25).^2+Y.^2);
v1=q1./((4*pi*e).*r1);
v2=q2./((4*pi*e).*r2);
v=v1+v2;

surf(x,y,v)