[petsc-users] Convergence rate for spatially varying Helmholtz system

[Amneet Bhalla]

>
>
>    For a diagonal system with this modest range of values Jacobi should
> converge in a single iteration.
>

This is what I wanted to confirm (and my expectation also). There could be
a bug in the way we are setting up the linear operators in the
preconditioner and the matrix-free solver. We need to do some debugging.

(with regard to the diagonal).

We have printed the matrix and viewed it in Matlab. It is a diagonal
matrix.
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