Resets a factored matrix to be treated as unfactored.
mat - the factored matrix to be reset
This routine should be used only with factored matrices formed by in-place
factorization via ILU(0) (or by in-place LU factorization for the
format). This option can save memory, for example, when solving nonlinear
systems with a matrix-free Newton-Krylov method and a matrix-based, in-place
Note that one can specify in-place ILU(0) factorization by calling
or by using the options -pc_type ilu -pc_factor_in_place
In-place factorization ILU(0) can also be used as a local solver for the blocks within the block Jacobi or additive Schwarz methods (runtime option: -sub_pc_factor_in_place). See Users-Manual: ch_pc for details on setting local solver options.
MatSetUnfactored_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatSetUnfactored_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c
MatSetUnfactored_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c
MatSetUnfactored_MPISELL in src/mat/impls/sell/mpi/mpisell.c