#include "petscmat.h" PetscErrorCode MatSetUnfactored(Mat mat)Logically Collective on Mat
|mat||- the factored matrix to be reset|
Note that one can specify in-place ILU(0) factorization by calling
PCType(pc,PCILU); PCFactorSeUseInPlace(pc);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.
Most users should employ the simplified KSP interface for linear solvers instead of working directly with matrix algebra routines such as this. See, e.g., KSPCreate().