#include "petscsles.h" int SLESSetOperators(SLES sles,Mat Amat,Mat Pmat,MatStructure flag)Collective on SLES and Mat
| sles | - the SLES context | |
| Amat | - the matrix associated with the linear system | |
| Pmat | - the matrix to be used in constructing the preconditioner, usually the same as Amat. | |
| flag | - flag indicating information about the preconditioner matrix structure during successive linear solves. This flag is ignored the first time a linear system is solved, and thus is irrelevant when solving just one linear system. |
SAME_PRECONDITIONER -
Pmat is identical during successive linear solves.
This option is intended for folks who are using
different Amat and Pmat matrices and want to reuse the
same preconditioner matrix. For example, this option
saves work by not recomputing incomplete factorization
for ILU/ICC preconditioners.
SAME_NONZERO_PATTERN -
Pmat has the same nonzero structure during
successive linear solves.
DIFFERENT_NONZERO_PATTERN -
Pmat does not have the same nonzero structure.
If in doubt about whether your preconditioner matrix has changed structure or not, use the flag DIFFERENT_NONZERO_PATTERN.
Level:beginner
Location:src/sles/interface/sles.c
Index of all SLES routines
Table of Contents for all manual pages
Index of all manual pages