[Dune] Initialization of BlockVector with C array or Eigen array

[Markus Blatt]

On Tue, May 26, 2015 at 09:38:22PM +0200, Tobias Ritschel wrote:

> I would like to use dune-istl to solve linear systems in a fully implicit
> two-phase solver and I use Eigen to generate the Jacobi matrix and
> right-hand-side. Is there a way to initialize a
> BlockVector<FieldVector<double,1>> with a Eigen array or a C array without
> copying?

Just a comment: There is not so much overhead when copying a
vector. It does not need much time. In any case dune-istl will create
quite a few vectors depending on the solver/preconditioner
(e.g. BiCGStab creates 5, AMG approximately another 5).

Saving just one for the cost of spending valuable thesis time might
not be a good investment.

And in OPM there is already quite some copying ;)

Markus

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