[petsc-users] GAMG

[Jed Brown]

"Kong, Fande" <fande.kong at inl.gov> writes:
> If the boundary values are not zero, no way to maintain symmetry unless we
> reduce the extra part of  the matrix. Not updating the columns is better in
> this situation.

The inhomogeneity of the boundary condition has nothing to do with operator symmetry.

I like this formulation for Dirichlet conditions.

https://scicomp.stackexchange.com/questions/3298/appropriate-space-for-weak-solutions-to-an-elliptical-pde-with-mixed-inhomogeneo/3300#3300
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