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The following task has a new comment added:

FS#206 - Problem using solver with hierarchical vector and matrix
User who did this: - Markus Blatt (mblatt)

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Currently there is no solve method in the BCRSMatrix (as this would
require a sparse direct solver, which we currently lack.)

But our solvers support recursion. That is one can tell them to
recursively apply the preconditioner (e.g. jacobi) on deeper
levels and then solve exactly on the next one.

In your case the block recursion level needs to be set to 2.

For a more concise overview see our paper about ISTL for the PARA06 on
the publication page.
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More information can be found at the following URL:
http://hal.iwr.uni-heidelberg.de/flyspray/?do=details&id=206#comment201

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