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[Kent-Andre Mardal <kent-and@xxxxxxxxx>]

Kan du si ifra til Andy slik at han får oppdatert
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Kent

On 1 April 2011 23:43, Joachim Berdal Haga <jobh@xxxxxxxxx> wrote:

> Today seems like a good day to announce the cbc.block project -- Block
> operators for DOLFIN (in Python). Some of you attended my presentation
> earlier this year and know this work already (although it is now in a
> much better state). For everyone else, a short description:
>
> - Block operators may be defined from standard DOLFIN matrices and vectors
>    A = assemble(...); B = assemble(...); # etc
>    AA = block_mat([[A,B], [C,D]])
>
> - Preconditioners, inverses, and inner solvers are supported
>    AAprec = AA.scheme('gauss-seidel', inverse=ML)
>
> - A good selection of iterative solvers
>    AAinv = SymmLQ(AA, precond=AAprec)
>    x = AAinv*b
>
> - Matrix algebra is supported both through composition of operators...
>    S = C*ILU(A)*B-D
>    Spre = ConjGrad(S)
>
>  ...and through explicit matrix calculation via PyTrilinos
>    S = C*InvDiag(A)*B-D
>    Spre = ML(collapse(S))
>
> - And lots of demos! Have a look: http://launchpad.net/cbc.block
>
> (I will be on holiday the next weeks and may be slow to answer questions.)
>
> --
> -j.
>
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