Plotting a function with difference between 2 vectors?
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I want to plot 
where 
is the magnitude of the distance between 2 vectors: 
: 
where is the magnitude of the distance between 2 vectors: : If I would implement this idea in Matlab:
[r1,r2] = meshgrid(linspace(-1,1,100));
phi = 1./(r1-r2);
mesh(r1,r2,phi)
what's nor really any kind of potential. Instead
[r1,r2] = meshgrid(linspace(-1,1,100));
phi = 1./sqrt((r1.^2+r2.^2));
mesh(r1,r2,phi)
is drawing the shape I sougth. Where does this difference originate from?
采纳的回答
Cris LaPierre
2021-5-8
编辑：Cris LaPierre
2021-5-8
0 个投票
The shape is caused by where you can divide by 0. The difference is that, in the first case, this occurs along the diagonal line r1-r2=0. In the second case, the only time you divide by 0 is when r1=r2=0, hence the peak at a single point, (0,0).
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