> On 28 Sep 2016, at 17:38, Tomasz Salwa [RPG] <mmtjs@leeds.ac.uk> wrote:
>
> Dear Lawrence,
>
> Yes, I think I solve it directly. I just use numpy.linalg.solve. Could you indicate how to increase the tolerance?


Please see http://firedrakeproject.org/solving-interface.html#specifying-solution-methods

I think you want the ksp_rtol solver parameter.

Lawrence
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