Fieldsplit preconditioning #624
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jrmaddison
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Typo in test, still a bit of work to do. |
… of a Matrix, rather than a callable used to build a MatrixFreeMatrix
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Minimal change needed for PETSc fieldsplit preconditioning. Might be useful in some cases.
API updates to allow a general preconditioner to be supplied to a
LinearSolver.