On Dec 12, 2007, at 12:40 PM, [EMAIL PROTECTED] wrote:

. We have run into a problem in solving the
Poisson equation for a potential field with a varying charge density. I thought that someone might be able to explain why this script is disregarding the charge
density when it solves for the field.

What are you seeing that leads you to that conclusion? Given your boundary conditions, unless the solution you are seeing is POT=0 everywhere, then the charge density *is* having an effect. When I run your code, POT is definitely not zero everywhere and has undulations that seem consistent with your imposed sinusoidal charged density.

What version of FiPy are you running?
What platform?
What are you seeing?
What did you expect to see?
Have you plotted C_li or Rho to see if the charge distribution is what you think it is?

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