MatFactorGetSchurComplement#
Gets access to a Schur complement matrix using the current Schur data within a factored matrix
Synopsis#
#include "petscmat.h"
PetscErrorCode MatFactorGetSchurComplement(Mat F, Mat *S, MatFactorSchurStatus *status)
Logically Collective
Input Parameters#
F - the factored matrix obtained by calling
MatGetFactor()*S - location where to return the Schur complement, can be
NULLstatus - the status of the Schur complement matrix, can be
NULL
Notes#
You must call MatFactorSetSchurIS() before calling this routine.
Schur complement mode is currently implemented for sequential matrices with factor type of MATSOLVERMUMPS
The routine returns a the Schur Complement stored within the data structures of the solver.
If MatFactorInvertSchurComplement() has previously been called, the returned matrix is actually the inverse of the Schur complement.
The returned matrix should not be destroyed; the caller should call MatFactorRestoreSchurComplement() when the object is no longer needed.
Use MatFactorCreateSchurComplement() to create a copy of the Schur complement matrix that is within a factored matrix
See MatCreateSchurComplement() or MatGetSchurComplement() for ways to create virtual or approximate Schur complements.
See Also#
Matrices, Mat, MatGetFactor(), MatFactorSetSchurIS(), MatFactorRestoreSchurComplement(), MatFactorCreateSchurComplement(), MatFactorSchurStatus
Level#
advanced
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages