[Trilinos-Users] Symmetric matrices

Heroux, Michael A maherou at sandia.gov
Wed Nov 7 12:53:34 MST 2012


It is fairly straight-forward to write a simple wrapper around existing
Epetra capabilities in order to provide a matrix-vector multiplication
operation that works when storing just the upper or lower triangle. It is
more challenging to do so with existing Trilinos preconditioners.  None of
them takes advantage of symmetric storage at this time.

Do you want Trilinos preconditioners for symmetric operators, or just the
matrix-vector multiplication?


On 11/7/12 1:34 PM, "Bart Janssens" <bart.janssens at lid.kviv.be> wrote:

>I have a problem involving symmetric matrices, and to save memory I'd
>like to only store the upper triangular part and the diagonal. I would
>use the following solvers:
>- MUMPS (through Amesos) on a matrix that stays the same during the
>entire simulation, so I can reuse the factoring
>- Belos Recycling Conjugate Gradient for a matrix that stays nearly or
>completely the same for all time steps, but may be too big to factor
>Is it possible to keep only the upper part of the matrix in these
>cases, or do the solvers not support it? Sorry if I missed anything, I
>couldn't find any references to symmetric matrix construction in the
>Trilinos-Users mailing list
>Trilinos-Users at software.sandia.gov

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