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HELP:) Electric Field lines on MatLab (solving fields given coordinate points)

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Matlab
Matlab 2016-5-13
评论： Rena Berman 2020-5-14
Currently I have used and edited a code that I have found on creating electric field lines on MatLab, I have use two test points at set coordinates with set charges [1 -1], yet the field lines that I get on my solution is incorrect. The direction of the lines should be all away from positive and towards the negative charges. Please help me fix this code!
x=[3 8];
y=[5 5];
q=[-1 1];
% Coulumb's number
ke = 8.9875517873681764e9;
xi=linspace(0,10,33);
yi=linspace(0,10,33);
[XI YI] = meshgrid(xi,yi);
zi = complex(XI,YI);
z = complex(x,y);
[ZI Z]=ndgrid(zi(:),z(:));
dZ = ZI-Z;
Zn = abs(dZ);
E = (dZ./Zn.^3)*(q(:)*ke);
E = reshape(E,size(XI));
En = abs(E);
Ex = real(E);
Ey = imag(E);
figure;
quiver(XI,YI,Ex./E,Ey./E);
hold on;
plot(x,y,'or');
axis equal;
Thank you,
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Rik
Rik 2020-4-23
Why did you remove your question content? Now it has become utterly useles. Even old questions can be very useful if they happen to solve the exact problem you're having.

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回答（2 个）

Matt
Matt 2016-5-13
In your line quiver(XI,YI,Ex./E,Ey./E); change E to En.
You are currently dividing by a complex number.
Antonio Cedillo Hernandez
Here you have the full MATLAB code explained (in spanish but the first comment is the code): https://www.youtube.com/watch?v=k9srU6aQfL0

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