which solvers do you think I can examin and see if they can be used
    instead of SolverCG?

That's the wrong question. If you know that the matrix you have *should be* symmetric and positive definite, but the CG solver does not converge, then you need to debug why the matrix *is not* s.p.d. Using a different solver might allow you to solve the linear system, but since the linear system is apparently not the correct one, the solution will also not be correct.


Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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