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help for poisson equation

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Old   June 25, 2003, 22:05
Default help for poisson equation
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I used finite element method to solve poisson equation--d/dx(du/dx)+d/dy(du/dy)=f(x,y) in a square domain. f(x,y)=200(only at the mid point of the domain)and u(x,y) all boundary. I have examine my stiffness matrix and stress matrix,but with my own solver I can not get the symmetric answers.I wonder if there are any one can help me with the solver (no matter iterative method or direct ones). thank alot.
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