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Re: visualizing fields near charged objects

At 6:02 AM -0800 2/9/01, John Mallinckrodt wrote:
Once the calculation is finished, finding the Laplacian for those
cells whose value was specified as a part of the boundary
condition gives the charge density (times some appropriate
constant) in those cells.

Do you mean the Laplacian or the gradient? It is the potential
gradient that is proportional to the charge density. Also, John
Denker seems to believe that total charge should be constant
during iteration. Have you any reason to believe that should be